{"id":34020,"date":"2026-10-12T15:44:00","date_gmt":"2026-10-12T08:44:00","guid":{"rendered":"https:\/\/etest.edu.vn\/?p=34020"},"modified":"2026-10-12T15:45:55","modified_gmt":"2026-10-12T08:45:55","slug":"rectangle-trong-bai-thi-sat","status":"publish","type":"post","link":"https:\/\/etest.edu.vn\/en\/rectangle-trong-bai-thi-sat\/","title":{"rendered":"Rectangle trong b\u00e0i thi SAT: C\u00f4ng th\u1ee9c, t\u00ednh ch\u1ea5t v\u00e0 d\u1ea1ng b\u00e0i th\u01b0\u1eddng g\u1eb7p"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Rectangle \u2013 h\u00ecnh ch\u1eef nh\u1eadt \u2013 l\u00e0 m\u1ed9t trong nh\u1eefng h\u00ecnh h\u1ecdc c\u01a1 b\u1ea3n nh\u01b0ng c\u00f3 th\u1ec3 xu\u1ea5t hi\u1ec7n trong <\/span><a href=\"https:\/\/etest.edu.vn\/en\/sat-math\/\"><span style=\"font-weight: 400;\">SAT Math<\/span><\/a><span style=\"font-weight: 400;\"> d\u01b0\u1edbi nhi\u1ec1u d\u1ea1ng kh\u00e1c nhau. B\u00ean c\u1ea1nh c\u00e1c c\u00e2u h\u1ecfi tr\u1ef1c ti\u1ebfp v\u1ec1 di\u1ec7n t\u00edch v\u00e0 chu vi, \u0111\u1ec1 thi c\u00f3 th\u1ec3 k\u1ebft h\u1ee3p rectangle v\u1edbi \u0111\u1ea1i s\u1ed1, \u0111\u1ecbnh l\u00fd Pythagore, l\u01b0\u1ee3ng gi\u00e1c, m\u1eb7t ph\u1eb3ng t\u1ecda \u0111\u1ed9 ho\u1eb7c c\u00e1c h\u00ecnh h\u1ecdc kh\u00e1c.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u00ec v\u1eady, thay v\u00ec ch\u1ec9 h\u1ecdc thu\u1ed9c c\u00f4ng th\u1ee9c, h\u1ecdc sinh c\u1ea7n hi\u1ec3u r\u00f5 t\u00ednh ch\u1ea5t c\u1ee7a rectangle, m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng v\u00e0 c\u00e1ch nh\u1eadn di\u1ec7n d\u1ea1ng b\u00e0i. <\/span><b>ETEST<\/b><span style=\"font-weight: 400;\"> s\u1ebd t\u1ed5ng h\u1ee3p \u0111\u1ea7y \u0111\u1ee7 ki\u1ebfn th\u1ee9c, <\/span><b>c\u00f4ng th\u1ee9c, d\u1ea1ng b\u00e0i v\u00e0 b\u00e0i t\u1eadp Rectangle th\u01b0\u1eddng g\u1eb7p trong SAT Math<\/b><span style=\"font-weight: 400;\"> trong b\u00e0i vi\u1ebft d\u01b0\u1edbi \u0111\u00e2y.<\/span><\/p>\n<h2><b>Rectangle l\u00e0 g\u00ec?<\/b><\/h2>\n<p><b>Rectangle l\u00e0 h\u00ecnh ch\u1eef nh\u1eadt \u2013 m\u1ed9t t\u1ee9 gi\u00e1c c\u00f3 b\u1ed1n g\u00f3c vu\u00f4ng, trong \u0111\u00f3 m\u1ed7i g\u00f3c c\u00f3 s\u1ed1 \u0111o 90\u00b0.<\/b><\/p>\n<p><span style=\"font-weight: 400;\">M\u1ed9t rectangle c\u00f3:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">2 c\u1eb7p c\u1ea1nh \u0111\u1ed1i di\u1ec7n song song.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">2 c\u1eb7p c\u1ea1nh \u0111\u1ed1i di\u1ec7n b\u1eb1ng nhau.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">4 g\u00f3c \u0111\u1ec1u b\u1eb1ng 90\u00b0.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">2 \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng nhau.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">2 \u0111\u01b0\u1eddng ch\u00e9o c\u1eaft nhau t\u1ea1i trung \u0111i\u1ec3m c\u1ee7a m\u1ed7i \u0111\u01b0\u1eddng.<\/span><\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-34025\" src=\"https:\/\/etest.edu.vn\/wp-content\/uploads\/2026\/10\/rectangle-trong-bai-thi-sat-4.png\" alt=\"Rectangle l\u00e0 g\u00ec?\" width=\"552\" height=\"332\" srcset=\"https:\/\/etest.edu.vn\/wp-content\/uploads\/2026\/10\/rectangle-trong-bai-thi-sat-4.png 552w, https:\/\/etest.edu.vn\/wp-content\/uploads\/2026\/10\/rectangle-trong-bai-thi-sat-4-18x12.png 18w\" sizes=\"(max-width: 552px) 100vw, 552px\" \/><\/p>\n<h2><b>C\u00f4ng th\u1ee9c Rectangle trong SAT Math<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">\u0110\u1ec3 l\u00e0m t\u1ed1t c\u00e1c c\u00e2u h\u1ecfi v\u1ec1 h\u00ecnh ch\u1eef nh\u1eadt, h\u1ecdc sinh n\u00ean n\u1eafm ch\u1eafc nh\u1eefng c\u00f4ng th\u1ee9c d\u01b0\u1edbi \u0111\u00e2y.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Trong c\u00e1c c\u00f4ng th\u1ee9c, quy \u01b0\u1edbc:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>(l)<\/b><span style=\"font-weight: 400;\">: chi\u1ec1u d\u00e0i h\u00ecnh ch\u1eef nh\u1eadt<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>(w)<\/b><span style=\"font-weight: 400;\">: chi\u1ec1u r\u1ed9ng h\u00ecnh ch\u1eef nh\u1eadt<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>(P)<\/b><span style=\"font-weight: 400;\">: chu vi<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>(A)<\/b><span style=\"font-weight: 400;\">: di\u1ec7n t\u00edch<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>(d)<\/b><span style=\"font-weight: 400;\">: \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng ch\u00e9o<\/span><\/li>\n<\/ul>\n<h3><b>C\u00f4ng th\u1ee9c chu vi h\u00ecnh ch\u1eef nh\u1eadt (Perimeter)<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">V\u00ec h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 hai c\u1eb7p c\u1ea1nh \u0111\u1ed1i di\u1ec7n b\u1eb1ng nhau n\u00ean: <\/span><b>P = 2*(l+w)<\/b><\/p>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5, n\u1ebfu m\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chi\u1ec1u d\u00e0i 10 v\u00e0 chi\u1ec1u r\u1ed9ng 6: <\/span><b>P = 2*(10+6)=32<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Ng\u01b0\u1ee3c l\u1ea1i, n\u1ebfu \u0111\u1ec1 b\u00e0i cho chu vi v\u00e0 y\u00eau c\u1ea7u t\u00ecm m\u1ed9t c\u1ea1nh, c\u00f3 th\u1ec3 bi\u1ebfn \u0111\u1ed5i c\u00f4ng th\u1ee9c: <\/span><b>l = P\/2-w <\/b><span style=\"font-weight: 400;\">or <\/span><b>w = P\/2-l<\/b><\/p>\n<h3><b>C\u00f4ng th\u1ee9c di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt (Area)<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng: <\/span><b>A = l*w<\/b><\/p>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5, n\u1ebfu chi\u1ec1u d\u00e0i h\u00ecnh ch\u1eef nh\u1eadt l\u00e0 12 v\u00e0 chi\u1ec1u r\u1ed9ng l\u00e0 5: <\/span><b>A = 12*5=60<\/b><\/p>\n<p><span style=\"font-weight: 400;\">N\u1ebfu \u0111\u1ec1 cho di\u1ec7n t\u00edch v\u00e0 m\u1ed9t c\u1ea1nh, c\u00f3 th\u1ec3 t\u00ecm c\u1ea1nh c\u00f2n l\u1ea1i: <\/span><b>l = A\/w <\/b><span style=\"font-weight: 400;\">or <\/span><b>w = A\/l<\/b><\/p>\n<h3><b>C\u00f4ng th\u1ee9c \u0111\u01b0\u1eddng ch\u00e9o h\u00ecnh ch\u1eef nh\u1eadt (Diagonal)<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">\u0110\u01b0\u1eddng ch\u00e9o c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt t\u1ea1o th\u00e0nh m\u1ed9t tam gi\u00e1c vu\u00f4ng, v\u00ec v\u1eady c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng \u0111\u1ecbnh l\u00fd Pythagore: <\/span><b>d = \u221a(l\u00b2+w\u00b2)<\/b><\/p>\n<p><span style=\"font-weight: 400;\">V\u00ed d\u1ee5, n\u1ebfu h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chi\u1ec1u d\u00e0i 12 v\u00e0 chi\u1ec1u r\u1ed9ng 5:<\/span><b> d = \u221a(12\u00b2+5\u00b2)=13<\/b><\/p>\n<h2><b>C\u00e1c d\u1ea1ng b\u00e0i t\u1eadp Rectangle th\u01b0\u1eddng g\u1eb7p trong SAT Math<\/b><\/h2>\n<p><a href=\"https:\/\/etest.edu.vn\/en\/hoc-sat-la-gi-va-tam-quan-trong-cua-viet-hoc-sat\/\"><span style=\"font-weight: 400;\">SAT<\/span><\/a><span style=\"font-weight: 400;\"> kh\u00f4ng ch\u1ec9 h\u1ecfi h\u1ecdc sinh nh\u1edb c\u00f4ng th\u1ee9c. M\u1ed9t b\u00e0i Rectangle c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c bi\u1ebfn \u0111\u1ed5i th\u00e0nh b\u00e0i to\u00e1n \u0111\u1ea1i s\u1ed1, l\u01b0\u1ee3ng gi\u00e1c ho\u1eb7c h\u00ecnh h\u1ecdc t\u1ecda \u0111\u1ed9.<\/span><\/p>\n<p><b>B\u00e0i t\u1eadp 1: The length of a rectangle is four less than twice its width. If (x) is the width of the rectangle, what is the perimeter of the rectangle?<\/b><\/p>\n<ol>\n<li><span style=\"font-weight: 400;\"> (2x\u00b2-4x)<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">B. (3x-4)<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C. (6x-4)<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">D. (6x+4)<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">E. (6x-8)<\/span><\/li>\n<\/ol>\n<p><b>L\u1eddi gi\u1ea3i:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Width: w=x<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Length: l=2x-4<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Chu vi: P=2(l+w) <\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span> <span style=\"font-weight: 400;\">P=2[(2x-4)+x]<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span> <span style=\"font-weight: 400;\">P=2(3x-4)<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span> <span style=\"font-weight: 400;\">P=6x-8<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u00e1p \u00e1n: E. (6x-8)<\/span><\/p>\n<p><b>B\u00e0i t\u1eadp 2: The length of a rectangle is four times the length of a square. If the rectangle and the square share a side, and the perimeter of the square is 2 m, what is the perimeter of the rectangle?<\/b><\/p>\n<ol>\n<li><span style=\"font-weight: 400;\"> 5 units<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">B. 6 units<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C. 8 units<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">D. 10 units<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">E. 20 units<\/span><\/li>\n<\/ol>\n<p><b>L\u1eddi gi\u1ea3i:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">G\u1ecdi c\u1ea1nh h\u00ecnh vu\u00f4ng l\u00e0 (s), ta c\u00f3: 4s=2 -&gt; s=0.5<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Chi\u1ec1u d\u00e0i rectangle b\u1eb1ng 4 l\u1ea7n c\u1ea1nh h\u00ecnh vu\u00f4ng: l=4(0.5)=2<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u00ec rectangle v\u00e0 square share a side n\u00ean: w=0.5<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Chu vi rectangle: P=2(2+0.5) -&gt; P=5<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u00e1p \u00e1n: A. 5 units<\/span><\/p>\n<p><b>B\u00e0i t\u1eadp 3: Diagonal AC of rectangle ABCD creates angle ACB, the tangent of which is 8. If the length of side BC is 8 units, what is the perimeter of rectangle ABCD?<\/b><\/p>\n<ol>\n<li><span style=\"font-weight: 400;\"> 18 units<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">B. 32 units<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C. 64 units<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">D. 72 units<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">E. 144 units<\/span><\/li>\n<\/ol>\n<p><b>L\u1eddi gi\u1ea3i:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">X\u00e9t tam gi\u00e1c vu\u00f4ng ABCABCABC, ta c\u00f3:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">tan(\u2220ACB)=AB\/BC\u200b<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Theo \u0111\u1ec1 b\u00e0i, BC=8 v\u00e0 tan\u2061(\u2220ACB)=8, suy ra:\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">8=AB\u200b\/8<\/span><\/p>\n<p><span style=\"font-weight: 400;\">AB=8\u00d78=64<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u00ec ABCD l\u00e0 h\u00ecnh ch\u1eef nh\u1eadt n\u00ean chu vi \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">P=2(AB+BC)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">P=2(64+8)\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">P=144<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u00e1p \u00e1n: E. 144 units<\/span><\/p>\n<p><b>B\u00e0i t\u1eadp 4: Triangle DEC is inscribed in rectangle ABCD. If side AB = 30 units, side EC = 17 units, and side AE = side EB, what is the area of triangle DEC?<\/b><\/p>\n<ol>\n<li><span style=\"font-weight: 400;\"> 60 square units<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">B. 120 square units<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C. 136 square units<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">D. 240 square units<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">E. 255 square units<\/span><\/li>\n<\/ol>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-34024\" src=\"https:\/\/etest.edu.vn\/wp-content\/uploads\/2026\/10\/rectangle-trong-bai-thi-sat-3.png\" alt=\"Rectangle trong SAT Math\" width=\"174\" height=\"130\" srcset=\"https:\/\/etest.edu.vn\/wp-content\/uploads\/2026\/10\/rectangle-trong-bai-thi-sat-3.png 174w, https:\/\/etest.edu.vn\/wp-content\/uploads\/2026\/10\/rectangle-trong-bai-thi-sat-3-16x12.png 16w\" sizes=\"(max-width: 174px) 100vw, 174px\" \/><\/p>\n<p><b>L\u1eddi gi\u1ea3i:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">V\u00ec AE=EB v\u00e0 AB=30 units n\u00ean:\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">EB=AB\/2=30\/2=15\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">X\u00e9t tam gi\u00e1c vu\u00f4ng EBC, \u00e1p d\u1ee5ng \u0111\u1ecbnh l\u00fd Pythagore:\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">EC\u00b2=EB\u00b2+BC\u00b2\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">17\u00b2=15\u00b2+BC\u00b2\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">BC\u00b2=289\u2212225=64\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">BC=8<\/span><\/p>\n<p><span style=\"font-weight: 400;\">V\u00ec ABCD l\u00e0 h\u00ecnh ch\u1eef nh\u1eadt n\u00ean: DC=AB=30<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Di\u1ec7n t\u00edch tam gi\u00e1c DEC \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng:\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A=(DC*BC)\/2<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A=(30*8)\/2<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A=120<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u00e1p \u00e1n: B. 120 square units<\/span><\/p>\n<p><b>B\u00e0i t\u1eadp 5: The area of a rectangle is (x^2+7x+10) square units. If the length of the rectangle is (x+2) units, what is the width of the rectangle?<\/b><\/p>\n<ol>\n<li><span style=\"font-weight: 400;\"> (x+2) units<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">B. (x+4) units<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">C. (x+5) units<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">D. (2x+4) units<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">E. (x^2+6x+8) units<\/span><\/li>\n<\/ol>\n<p><b>\u0110\u00e1p \u00e1n: C. (x+5) units<\/b><\/p>\n<p><b>L\u1eddi gi\u1ea3i:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">Di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng c\u00f4ng th\u1ee9c:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A=l*w<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Suy ra chi\u1ec1u r\u1ed9ng:\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">w=A\/l<\/span><\/p>\n<p><span style=\"font-weight: 400;\">w=(x\u00b2+7x+10)\/(x+2)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">w=(x+2)*(x+5)\/(x+2)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">w=x+5<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u0110\u00e1p \u00e1n: C. (x+5) units.<\/span><\/p>\n<h2><b>T\u1eeb v\u1ef1ng ti\u1ebfng Anh v\u1ec1 Rectangle trong SAT Math<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Khi l\u00e0m SAT Math, \u0111\u1ec1 b\u00e0i th\u01b0\u1eddng s\u1eed d\u1ee5ng thu\u1eadt ng\u1eef h\u00ecnh h\u1ecdc b\u1eb1ng ti\u1ebfng Anh. Ghi nh\u1edb c\u00e1c t\u1eeb v\u1ef1ng d\u01b0\u1edbi \u0111\u00e2y s\u1ebd gi\u00fap h\u1ecdc sinh \u0111\u1ecdc \u0111\u1ec1 nhanh v\u00e0 x\u00e1c \u0111\u1ecbnh ch\u00ednh x\u00e1c d\u1eef ki\u1ec7n.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td><b>Vocabulary<\/b><\/td>\n<td><b>Vietnamese Meaning<\/b><\/td>\n<\/tr>\n<tr>\n<td><b>Rectangle<\/b><\/td>\n<td><span style=\"font-weight: 400;\">H\u00ecnh ch\u1eef nh\u1eadt<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Side<\/b><\/td>\n<td><span style=\"font-weight: 400;\">C\u1ea1nh<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Length<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Chi\u1ec1u d\u00e0i<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Width<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Chi\u1ec1u r\u1ed9ng<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Vertex \/ Vertices<\/b><\/td>\n<td><span style=\"font-weight: 400;\">\u0110\u1ec9nh \/ C\u00e1c \u0111\u1ec9nh<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Angle<\/b><\/td>\n<td><span style=\"font-weight: 400;\">G\u00f3c<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Right angle<\/b><\/td>\n<td><span style=\"font-weight: 400;\">G\u00f3c vu\u00f4ng<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Opposite sides<\/b><\/td>\n<td><span style=\"font-weight: 400;\">C\u1ea1nh \u0111\u1ed1i di\u1ec7n<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Adjacent sides<\/b><\/td>\n<td><span style=\"font-weight: 400;\">C\u1ea1nh k\u1ec1 nhau<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Parallel<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Song song<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Congruent<\/b><\/td>\n<td><span style=\"font-weight: 400;\">B\u1eb1ng nhau<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Diagonal<\/b><\/td>\n<td><span style=\"font-weight: 400;\">\u0110\u01b0\u1eddng ch\u00e9o<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Midpoint<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Trung \u0111i\u1ec3m<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Perimeter<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Chu vi<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Area<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Di\u1ec7n t\u00edch<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Square unit<\/b><\/td>\n<td><span style=\"font-weight: 400;\">\u0110\u01a1n v\u1ecb vu\u00f4ng<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Unit<\/b><\/td>\n<td><span style=\"font-weight: 400;\">\u0110\u01a1n v\u1ecb<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Right triangle<\/b><\/td>\n<td><span style=\"font-weight: 400;\">Tam gi\u00e1c vu\u00f4ng<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Hypotenuse<\/b><\/td>\n<td><span style=\"font-weight: 400;\">C\u1ea1nh huy\u1ec1n<\/span><\/td>\n<\/tr>\n<tr>\n<td><b>Pythagorean theorem<\/b><\/td>\n<td><span style=\"font-weight: 400;\">\u0110\u1ecbnh l\u00fd Pythagore<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b>M\u1ed9t s\u1ed1 c\u1ee5m t\u1eeb th\u01b0\u1eddng g\u1eb7p<\/b><\/h3>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>the length of the rectangle<\/b><span style=\"font-weight: 400;\"> \u2192 chi\u1ec1u d\u00e0i h\u00ecnh ch\u1eef nh\u1eadt<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>the width of the rectangle<\/b><span style=\"font-weight: 400;\"> \u2192 chi\u1ec1u r\u1ed9ng h\u00ecnh ch\u1eef nh\u1eadt<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>the area of the rectangle<\/b><span style=\"font-weight: 400;\"> \u2192 di\u1ec7n t\u00edch h\u00ecnh ch\u1eef nh\u1eadt<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>the perimeter of the rectangle<\/b><span style=\"font-weight: 400;\"> \u2192 chu vi h\u00ecnh ch\u1eef nh\u1eadt<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>the length of the diagonal<\/b><span style=\"font-weight: 400;\"> \u2192 \u0111\u1ed9 d\u00e0i \u0111\u01b0\u1eddng ch\u00e9o<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>opposite sides are congruent<\/b><span style=\"font-weight: 400;\"> \u2192 c\u00e1c c\u1ea1nh \u0111\u1ed1i di\u1ec7n b\u1eb1ng nhau<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>opposite sides are parallel<\/b><span style=\"font-weight: 400;\"> \u2192 c\u00e1c c\u1ea1nh \u0111\u1ed1i di\u1ec7n song song<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>what is the value of&#8230;?<\/b><span style=\"font-weight: 400;\"> \u2192 gi\u00e1 tr\u1ecb c\u1ee7a&#8230; l\u00e0 bao nhi\u00eau?<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>what is the length of&#8230;?<\/b><span style=\"font-weight: 400;\"> \u2192 \u0111\u1ed9 d\u00e0i c\u1ee7a&#8230; l\u00e0 bao nhi\u00eau?<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>what is the area of&#8230;?<\/b><span style=\"font-weight: 400;\"> \u2192 di\u1ec7n t\u00edch c\u1ee7a&#8230; l\u00e0 bao nhi\u00eau?<\/span><\/li>\n<\/ul>\n<h2><b>FAQ v\u1ec1 Rectangle trong SAT Math<\/b><\/h2>\n<h3><b>Rectangle trong SAT Math c\u1ea7n nh\u1edb nh\u1eefng c\u00f4ng th\u1ee9c n\u00e0o?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Ngo\u00e0i c\u00f4ng th\u1ee9c, h\u1ecdc sinh c\u1ea7n n\u1eafm c\u00e1c t\u00ednh ch\u1ea5t nh\u01b0 b\u1ed1n g\u00f3c vu\u00f4ng, hai c\u1eb7p c\u1ea1nh \u0111\u1ed1i di\u1ec7n b\u1eb1ng nhau v\u00e0 song song, hai \u0111\u01b0\u1eddng ch\u00e9o b\u1eb1ng nhau.<\/span><\/p>\n<h3><b>C\u00f4ng th\u1ee9c di\u1ec7n t\u00edch rectangle c\u00f3 \u0111\u01b0\u1ee3c cung c\u1ea5p trong SAT kh\u00f4ng?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">C\u00f3. Reference sheet c\u1ee7a SAT Math c\u00f3 c\u00f4ng th\u1ee9c di\u1ec7n t\u00edch rectangle. Tuy nhi\u00ean, h\u1ecdc sinh v\u1eabn c\u1ea7n hi\u1ec3u c\u00e1ch \u00e1p d\u1ee5ng v\u00e0 bi\u1ebfn \u0111\u1ed5i c\u00f4ng th\u1ee9c, b\u1edfi c\u00e2u h\u1ecfi c\u00f3 th\u1ec3 y\u00eau c\u1ea7u t\u00ecm m\u1ed9t \u0111\u1ea1i l\u01b0\u1ee3ng ch\u01b0a bi\u1ebft ho\u1eb7c k\u1ebft h\u1ee3p rectangle v\u1edbi c\u00e1c ki\u1ebfn th\u1ee9c kh\u00e1c.<\/span><\/p>\n<h3><b>Rectangle c\u00f3 th\u1ec3 xu\u1ea5t hi\u1ec7n trong b\u00e0i to\u00e1n \u0111\u1ea1i s\u1ed1 c\u1ee7a SAT Math kh\u00f4ng?<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">C\u00f3. SAT c\u00f3 th\u1ec3 bi\u1ec3u di\u1ec5n chi\u1ec1u d\u00e0i ho\u1eb7c chi\u1ec1u r\u1ed9ng c\u1ee7a rectangle b\u1eb1ng bi\u1ebfn (x), sau \u0111\u00f3 y\u00eau c\u1ea7u h\u1ecdc sinh l\u1eadp ph\u01b0\u01a1ng tr\u00ecnh, bi\u1ebfn \u0111\u1ed5i bi\u1ec3u th\u1ee9c ho\u1eb7c gi\u1ea3i ph\u01b0\u01a1ng tr\u00ecnh \u0111\u1ec3 t\u00ecm di\u1ec7n t\u00edch, chu vi ho\u1eb7c m\u1ed9t k\u00edch th\u01b0\u1edbc ch\u01b0a bi\u1ebft.<\/span><\/p>\n<h2><b>Luy\u1ec7n SAT Math c\u00f9ng<\/b> <b>ETEST<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">N\u1eafm ch\u1eafc Rectangle l\u00e0 m\u1ed9t b\u01b0\u1edbc quan tr\u1ecdng \u0111\u1ec3 x\u00e2y d\u1ef1ng n\u1ec1n t\u1ea3ng Geometry trong SAT Math. Tuy nhi\u00ean, khi h\u01b0\u1edbng \u0111\u1ebfn m\u1ee5c ti\u00eau \u0111i\u1ec3m s\u1ed1 cao, h\u1ecdc sinh c\u1ea7n bi\u1ebft c\u00e1ch nh\u1eadn di\u1ec7n d\u1ea1ng b\u00e0i, k\u1ebft n\u1ed1i nhi\u1ec1u ki\u1ebfn th\u1ee9c v\u00e0 x\u1eed l\u00fd c\u00e2u h\u1ecfi ch\u00ednh x\u00e1c trong th\u1eddi gian gi\u1edbi h\u1ea1n.<\/span><\/p>\n<p><a href=\"https:\/\/etest.edu.vn\/en\/\"><b>ETEST<\/b><\/a><span style=\"font-weight: 400;\"> h\u1ed7 tr\u1ee3 h\u1ecdc sinh x\u00e2y d\u1ef1ng <\/span><a href=\"https:\/\/etest.edu.vn\/en\/7-buoc-hoc-sat-hieu-qua\/\"><b>l\u1ed9 tr\u00ecnh luy\u1ec7n thi SAT<\/b><\/a><span style=\"font-weight: 400;\"> d\u1ef1a tr\u00ean n\u0103ng l\u1ef1c v\u00e0 m\u1ee5c ti\u00eau \u0111i\u1ec3m s\u1ed1, \u0111\u1ed3ng th\u1eddi c\u00f3 c\u01a1 h\u1ed9i<\/span> <a href=\"https:\/\/etest.edu.vn\/en\/doi-ngu-giao-vien\/\"><b>t\u01b0 v\u1ea5n l\u1ed9 tr\u00ecnh 1:1 c\u00f9ng gi\u00e1o vi\u00ean \u0111\u1ea1t 1600\/1600 SAT<\/b><\/a><span style=\"font-weight: 400;\">, t\u1eeb \u0111\u00f3 x\u00e1c \u0111\u1ecbnh m\u1ee5c ti\u00eau v\u00e0 ph\u01b0\u01a1ng ph\u00e1p h\u1ecdc ph\u00f9 h\u1ee3p v\u1edbi n\u0103ng l\u1ef1c hi\u1ec7n t\u1ea1i.<\/span><\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-34023\" src=\"https:\/\/etest.edu.vn\/wp-content\/uploads\/2026\/10\/rectangle-trong-bai-thi-sat-2.jpg\" alt=\"Luy\u1ec7n SAT Math c\u00f9ng ETEST\" width=\"1920\" height=\"1080\" srcset=\"https:\/\/etest.edu.vn\/wp-content\/uploads\/2026\/10\/rectangle-trong-bai-thi-sat-2.jpg 1920w, https:\/\/etest.edu.vn\/wp-content\/uploads\/2026\/10\/rectangle-trong-bai-thi-sat-2-711x400.jpg 711w, https:\/\/etest.edu.vn\/wp-content\/uploads\/2026\/10\/rectangle-trong-bai-thi-sat-2-1400x788.jpg 1400w, https:\/\/etest.edu.vn\/wp-content\/uploads\/2026\/10\/rectangle-trong-bai-thi-sat-2-768x432.jpg 768w, https:\/\/etest.edu.vn\/wp-content\/uploads\/2026\/10\/rectangle-trong-bai-thi-sat-2-1536x864.jpg 1536w, https:\/\/etest.edu.vn\/wp-content\/uploads\/2026\/10\/rectangle-trong-bai-thi-sat-2-18x10.jpg 18w\" sizes=\"(max-width: 1920px) 100vw, 1920px\" \/><\/p>\n<div style=\"text-align: center; margin: 28px 0;\"><a style=\"display: inline-block; background: linear-gradient(135deg,#b32025 0%,#d9363e 100%); color: #ffffff !important; font-size: 18px; font-weight: bold; text-decoration: none; padding: 16px 34px; border-radius: 50px; box-shadow: 0 8px 20px rgba(179,32,37,0.25); transition: all 0.3s ease; letter-spacing: 0.3px;\" href=\"https:\/\/etest.edu.vn\/en\/khoa-hoc\/luyen-thi-sat\/\" target=\"_blank\" rel=\"noopener\">XEM KH\u00d3A H\u1eccC LUY\u1ec6N THI SAT<br \/>\n<\/a><\/div>\n\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-left kksr-valign-bottom\"\n    data-payload='{&quot;align&quot;:&quot;left&quot;,&quot;id&quot;:&quot;34020&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;bottom&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;0&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;0&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;\u0110\u00e1nh gi\u00e1 b\u00e0i vi\u1ebft&quot;,&quot;legend&quot;:&quot;0\\\/5 - (0 votes)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;Rectangle trong b\u00e0i thi SAT: C\u00f4ng th\u1ee9c, t\u00ednh ch\u1ea5t v\u00e0 d\u1ea1ng b\u00e0i th\u01b0\u1eddng g\u1eb7p&quot;,&quot;width&quot;:&quot;0&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; 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height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 19.2px;\">\n            <span class=\"kksr-muted\">Rate this article<\/span>\n    <\/div>\n    <\/div>","protected":false},"excerpt":{"rendered":"<p>Rectangle \u2013 h\u00ecnh ch\u1eef nh\u1eadt \u2013 l\u00e0 m\u1ed9t trong nh\u1eefng h\u00ecnh h\u1ecdc c\u01a1 b\u1ea3n nh\u01b0ng c\u00f3 th\u1ec3 xu\u1ea5t hi\u1ec7n trong SAT Math d\u01b0\u1edbi nhi\u1ec1u d\u1ea1ng kh\u00e1c nhau. B\u00ean c\u1ea1nh c\u00e1c c\u00e2u h\u1ecfi tr\u1ef1c ti\u1ebfp v\u1ec1 di\u1ec7n t\u00edch v\u00e0 chu vi, \u0111\u1ec1 thi c\u00f3 th\u1ec3 k\u1ebft h\u1ee3p rectangle v\u1edbi \u0111\u1ea1i s\u1ed1, \u0111\u1ecbnh l\u00fd Pythagore, l\u01b0\u1ee3ng gi\u00e1c, [&#8230;]","protected":false},"author":21,"featured_media":34022,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[285,1],"tags":[],"class_list":["post-34020","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sat","category-tin-tuc"],"acf":[],"_links":{"self":[{"href":"https:\/\/etest.edu.vn\/en\/wp-json\/wp\/v2\/posts\/34020","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/etest.edu.vn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/etest.edu.vn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/etest.edu.vn\/en\/wp-json\/wp\/v2\/users\/21"}],"replies":[{"embeddable":true,"href":"https:\/\/etest.edu.vn\/en\/wp-json\/wp\/v2\/comments?post=34020"}],"version-history":[{"count":3,"href":"https:\/\/etest.edu.vn\/en\/wp-json\/wp\/v2\/posts\/34020\/revisions"}],"predecessor-version":[{"id":34027,"href":"https:\/\/etest.edu.vn\/en\/wp-json\/wp\/v2\/posts\/34020\/revisions\/34027"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/etest.edu.vn\/en\/wp-json\/wp\/v2\/media\/34022"}],"wp:attachment":[{"href":"https:\/\/etest.edu.vn\/en\/wp-json\/wp\/v2\/media?parent=34020"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/etest.edu.vn\/en\/wp-json\/wp\/v2\/categories?post=34020"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/etest.edu.vn\/en\/wp-json\/wp\/v2\/tags?post=34020"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}