H\u00ecnh vu\u00f4ng l\u00e0 h\u00ecnh t\u1ee9 gi\u00e1c c\u00f3 4 c\u1ea1nh b\u1eb1ng nhau. H\u00ecnh vu\u00f4ng c\u00f3 \u0111\u1ea7y \u0111\u1ee7 t\u00ednh ch\u1ea5t c\u1ee7a m\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt, h\u00ecnh thoi v\u00e0 h\u00ecnh vu\u00f4ng. H\u00ecnh vu\u00f4ng c\u00f3 \u00a04 g\u00f3c vu\u00f4ng v\u00e0 vu\u00f4ng g\u00f3c t\u1ea1i trung \u0111i\u1ec3m, hai c\u1eb7p c\u1ea1nh h\u00ecnh vu\u00f4ng song song v\u1edbi nhau.<\/p>\n
C\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng s\u1ebd b\u1eb1ng b\u00ecnh ph\u01b0\u01a1ng chi\u1ec1u d\u00e0i c\u1ea1nh h\u00ecnh vu\u00f4ng:<\/p>\n
S= a2 <\/sup><\/p>\n Chu vi h\u00ecnh v\u00f4ng: c= 4.a<\/p>\n A ch\u00ednh l\u00e0 \u0111\u1ed9 d\u00e0i c\u1ee7a h\u00ecnh vu\u00f4ng<\/p>\n C\u0169ng gi\u1ed1ng nh\u01b0 nh\u1eefng h\u00ecnh kh\u00e1c th\u00ec c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng s\u1ebd \u0111\u01a1n gi\u1ea3n h\u01a1n nhi\u1ec1u n\u1ebfu nh\u01b0 ch\u00fang ta bi\u1ebft \u0111\u01b0\u1ee3c \u0111\u1ed9 d\u00e0i c\u1ee7a c\u00e1c c\u1ea1nh h\u00ecnh vu\u00f4ng.<\/p>\n B\u00e0i t\u1eadp 1: <\/strong><\/p>\n Ch\u00fang ta c\u00f3 h\u00ecnh vu\u00f4ng ABCD c\u00f3 chi\u1ec1u d\u00e0i c\u1ea1nh l\u00e0 5cm ch\u00fang ta s\u1ebd c\u00f3<\/p>\n L\u1eddi gi\u1ea3i:<\/strong><\/p>\n Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng ABCD: S(ABCD)=5\u00b2 = 25 cm\u00b2<\/p>\n Chu vi h\u00ecnh vu\u00f4ng ACBD: C(ABCD) = 4×5=20cm<\/p>\n B\u00e0i t\u1eadp 2<\/strong>:<\/p>\n M\u1ed9t h\u00ecnh vu\u00f4ng c\u00f3 chu vi 32 cm. H\u1ecfi di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh vu\u00f4ng \u0111\u00f3 b\u1eb1ng bao nhi\u00eau?<\/p>\n L\u1eddi gi\u1ea3i:<\/strong><\/p>\n C\u1ea1nh c\u1ee7a h\u00ecnh vu\u00f4ng l\u00e0: 32 : 4 = 8 (cm).<\/p>\n Di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng l\u00e0: 8 x 8 = 64 (cm2<\/sup>)<\/p>\n \u0110\u00e1p s\u1ed1: 64 (cm2<\/sup>)<\/p>\n B\u00e0i t\u1eadp 3<\/strong>: M\u1ed9t mi\u1ebfng \u0111\u1ea5t h\u00ecnh vu\u00f4ng, sau khi m\u1edf r\u1ed9ng v\u1ec1 m\u1ed9t ph\u00eda th\u00eam 8m th\u00ec \u0111\u01b0\u1ee3c m\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chu vi 116m. H\u1ecfi sau khi m\u1edf r\u1ed9ng, mi\u1ebfng \u0111\u1ea5t c\u00f3 di\u1ec7n t\u00edch l\u00e0 bao nhi\u00eau?<\/p>\n L\u1eddi gi\u1ea3i:<\/strong><\/p>\n Chu vi mi\u1ebfng \u0111\u1ea5t h\u00ecnh vu\u00f4ng l\u00e0:<\/p>\n 116 \u2013 8 x 2 = 100 (m)<\/p>\n C\u1ea1nh c\u1ee7a mi\u1ebfng \u0111\u1ea5t h\u00ecnh vu\u00f4ng (c\u0169ng l\u00e0 chi\u1ec1u r\u1ed9ng c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt) l\u00e0:<\/p>\n 100 : 4 = 25 (m)<\/p>\n Chi\u1ec1u d\u00e0i mi\u1ebfng \u0111\u1ea5t h\u00ecnh ch\u1eef nh\u1eadt l\u00e0:<\/p>\n 25 + 8 = 33 (m)<\/p>\n Sau khi m\u1edf r\u1ed9ng, mi\u1ebfng \u0111\u1ea5t c\u00f3 di\u1ec7n t\u00edch l\u00e0:<\/p>\n 25 x 33 = 825 (m2<\/sup>)<\/p>\n \u0110\u00e1p s\u1ed1: 825 (m2<\/sup>)<\/p>\n B\u00e0i t\u1eadp 4:<\/strong> T\u00ecm di\u1ec7n t\u00edch mi\u1ebfng \u0111\u1ea5t h\u00ecnh vu\u00f4ng, bi\u1ebft r\u1eb1ng khi m\u1edf r\u1ed9ng m\u1ed7i c\u1ea1nh c\u1ee7a mi\u1ebfng \u0111\u1ea5t th\u00eam 4 m th\u00ec di\u1ec7n t\u00edch t\u0103ng th\u00eam 224<\/p>\n L\u1eddi gi\u1ea3i:<\/strong><\/p>\n Ph\u1ea7n di\u1ec7n t\u00edch t\u0103ng th\u00eam l\u00e0 di\u1ec7n t\u00edch c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chi\u1ec1u r\u1ed9ng 4 m, chi\u1ec1u d\u00e0i b\u1eb1ng 2 l\u1ea7n c\u1ea1nh h\u00ecnh vu\u00f4ng v\u00e0 c\u1ed9ng th\u00eam 4 m.<\/p>\n Chi\u1ec1u d\u00e0i c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt n\u00f3i tr\u00ean l\u00e0:<\/p>\n 224 : 4 = 56 (m)<\/p>\n Hai l\u1ea7n c\u1ea1nh mi\u1ebfng \u0111\u1ea5t h\u00ecnh vu\u00f4ng b\u1eb1ng:<\/p>\n 56 \u2013 4 = 52 (m)<\/p>\n C\u1ea1nh mi\u1ebfng \u0111\u1ea5t h\u00ecnh vu\u00f4ng b\u1eb1ng:<\/p>\n 52 : 2 = 26 (m)<\/p>\n Di\u1ec7n t\u00edch mi\u1ebfng \u0111\u1ea5t h\u00ecnh vu\u00f4ng b\u1eb1ng:<\/p>\n 26 x 26 = 676 (m2<\/sup>)<\/p>\n \u0110\u00e1p s\u1ed1: 676 (m2<\/sup>)<\/p>\n B\u00e0i t\u1eadp 5:\u00a0<\/strong><\/p>\n Vi\u1ebft v\u00e0o \u00f4 tr\u1ed1ng theo m\u1eabu<\/p>\n L\u1eddi gi\u1ea3i:<\/u><\/strong><\/p>\n B\u00e0i t\u1eadp 6:<\/strong><\/p>\n Ng\u01b0\u1eddi ta u\u1ed1n m\u1ed9t \u0111o\u1ea1n d\u00e2y th\u00e9p v\u1eeba \u0111\u1ee7 th\u00e0nh m\u1ed9t h\u00ecnh vu\u00f4ng c\u00f3 c\u1ea1nh 10 cm. T\u00ednh \u0111\u1ed9 d\u00e0i \u0111o\u1ea1n d\u00e2y \u0111\u00f3.<\/p>\n L\u1eddi gi\u1ea3i<\/u><\/strong><\/p>\n \u0110\u1ed9 d\u00e0i \u0111o\u1ea1n d\u00e2y th\u00e9p l\u00e0:<\/p>\n 10 \u00d7 4 = 40 cm<\/p>\n B\u00e0i t\u1eadp 7: H\u01b0\u1edbng d\u1eabn gi\u1ea3i b\u00e0i t\u1eadp s\u1ed1 3 SGK)<\/strong><\/p>\n M\u1ed7i vi\u00ean g\u1ea1ch c\u00f3 c\u1ea1nh 20cm. T\u00ednh chu vi h\u00ecnh ch\u1eef nh\u1eadt gh\u00e9p b\u1edfi 3 vi\u00ean g\u1ea1ch nh\u01b0 th\u1ebf.<\/p>\n L\u1eddi gi\u1ea3i<\/u><\/strong><\/p>\n Chi\u1ec1u d\u00e0i c\u1ee7a m\u1ed7i vi\u00ean g\u1ea1ch l\u00e0: 20 \u00d7 3 = 60 (cm)<\/p>\n Chu vi h\u00ecnh ch\u1eef nh\u1eadt l\u00e0:<\/p>\n (20 + 60) \u00d7 2 = 160 (cm)<\/p>\n B\u00e0i t\u1eadp 7:<\/strong>\u00a0M\u1ed9t m\u1ea3nh \u0111\u1ea5t h\u00ecnh ch\u1eef nh\u1eadt c\u00f3 chi\u1ec1u d\u00e0i 64 m, chi\u1ec1u r\u1ed9ng 34 m. Ng\u01b0\u1eddi ta c\u1eaft gi\u1ea3m chi\u1ec1u d\u00e0i v\u00e0 t\u0103ng chi\u1ec1u r\u1ed9ng \u0111\u1ec3 mi\u1ebfng \u0111\u1ea5t l\u00e0 h\u00ecnh vu\u00f4ng, ph\u1ea7n di\u1ec7n t\u00edch gi\u1ea3m theo chi\u1ec1u d\u00e0i l\u00e0 272 . T\u00ednh ph\u1ea7n di\u1ec7n t\u00edch t\u0103ng th\u00eam theo chi\u1ec1u r\u1ed9ng.<\/p>\n L\u1eddi gi\u1ea3i:<\/strong><\/p>\n S\u1ed1 \u0111o b\u1ecb gi\u1ea3m c\u1ee7a chi\u1ec1u d\u00e0i m\u1ea3nh \u0111\u1ea5t l\u00e0:<\/p>\n 272 : 34 = 8 (m)<\/p>\n C\u1ea1nh c\u1ee7a mi\u1ebfng \u0111\u1ea5t h\u00ecnh vu\u00f4ng l\u00e0:<\/p>\n 64 \u2013 8 = 56 (m)<\/p>\n Chi\u1ec1u r\u1ed9ng m\u1ea3nh \u0111\u1ea5t \u0111\u01b0\u1ee3c t\u0103ng th\u00eam s\u1ed1 m\u00e9t l\u00e0:<\/p>\n 56 \u2013 34 = 22 (m)<\/p>\n Di\u1ec7n t\u00edch ph\u1ea7n t\u0103ng theo chi\u1ec1u r\u1ed9ng m\u1ea3nh \u0111\u1ea5t l\u00e0:<\/p>\n 56 x 22 = 1232 (m2<\/sup>)<\/p>\n \u0110\u00e1p s\u1ed1:<\/strong>\u00a01232 (m2<\/sup>)<\/p>\n Tr\u00ean \u0111\u00e2y l\u00e0 h\u01b0\u1edbng d\u1eabn v\u1ec1 c\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh vu\u00f4ng di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng m\u1ed9t c\u00e1ch c\u1ee5 th\u1ec3 v\u00e0 d\u1ec5 nh\u1edb nh\u1ea5t. B\u00ean c\u1ea1nh \u0111\u00f3, c\u00e1c b\u00e0i t\u1eadp \u00e1p d\u1ee5ng b\u00ean d\u01b0\u1edbi \u00a0s\u1ebd gi\u00fap c\u00e1c em luy\u1ec7n t\u1eadp \u0111\u01b0\u1ee3c nhi\u1ec1u h\u01a1n v\u00e0 d\u1ec5 nh\u1ea5t. H\u00e3y c\u00f9ng tham kh\u1ea3o c\u00e1c\u00a0 b\u00e0i vi\u1ebft t\u01b0\u01a1ng t\u1ef1 \u0111\u1ec3 h\u1ecdc t\u1ed1t nh\u1ea5t nh\u00e9. Ch\u00fac c\u00e1c b\u1ea1n th\u00e0nh c\u00f4ng .<\/p>\n","protected":false},"excerpt":{"rendered":" C\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh vu\u00f4ng c\u0169ng gi\u1ed1ng nh\u01b0 c\u00f4ng th\u1ee9c t\u00ednh chu vi di\u1ec7n t\u00edch nh\u1eefng h\u00ecnh kh\u00e1c. N\u1ebfu nh\u01b0 ch\u00fang ta kh\u00f4ng n\u1eafm ch\u1eafc \u0111\u01b0\u1ee3c ki\u1ebfn th\u1ee9c… <\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[413,406],"tags":[],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/posts\/9949"}],"collection":[{"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/comments?post=9949"}],"version-history":[{"count":0,"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/posts\/9949\/revisions"}],"wp:attachment":[{"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/media?parent=9949"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/categories?post=9949"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/tags?post=9949"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}B\u00e0i t\u1eadp \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c t\u00ednh chu vi h\u00ecnh vu\u00f4ng, di\u1ec7n t\u00edch h\u00ecnh vu\u00f4ng<\/strong><\/h3>\n
![\"\"](\"https:\/\/onthitot.com\/wp-content\/uploads\/2018\/09\/cong-thuc-tinh-chu-vi-hinh-vuong-va-bai-tap-ap-dung.jpg\")
<\/p>\n\n\n
\n C\u1ea1nh\u00a0h\u00ecnh\u00a0vu\u00f4ng<\/td>\n 8cm<\/td>\n 12cm<\/td>\n 31cm<\/td>\n 15cm<\/td>\n<\/tr>\n \n Chu\u00a0vi\u00a0h\u00ecnh\u00a0vu\u00f4ng<\/td>\n 8\u00a0\u00d7\u00a04\u00a0=\u00a032\u00a0(cm)<\/td>\n <\/td>\n <\/td>\n <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \n\n
\n C\u1ea1nh\u00a0h\u00ecnh\u00a0vu\u00f4ng<\/td>\n 8cm<\/td>\n 12cm<\/td>\n 31cm<\/td>\n 15cm<\/td>\n<\/tr>\n \n Chu\u00a0vi\u00a0h\u00ecnh\u00a0vu\u00f4ng<\/td>\n 8\u00a0\u00d7\u00a04\u00a0=\u00a032\u00a0(cm)<\/td>\n 12\u00a0\u00d7\u00a04\u00a0=\u00a048\u00a0(cm)<\/td>\n 31\u00a0\u00d7\u00a04\u00a0=\u00a0124\u00a0(cm)<\/td>\n 15\u00a0\u00d7\u00a04\u00a0=\u00a060\u00a0(cm)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n