* C\u00f4ng th\u1ee9c v\u00e0 c\u00e1ch t\u00ednh di\u1ec7n t\u00edch m\u1eb7t c\u1ea7u<\/strong><\/p>\n – C\u00f4ng Th\u1ee9c T\u00ednh Di\u1ec7n T\u00edch M\u1eb7t C\u1ea7u:<\/em><\/p>\n S = 4 x \u03c0 x r2<\/sup>\u00a0= \u03c0 x d2<\/sup><\/strong><\/p>\n Trong \u0111\u00f3:<\/p>\n – r:\u00a0<\/strong>b\u00e1n k\u00ednh h\u00ecnh c\u1ea7u, m\u1eb7t c\u1ea7u <\/p>\n * C\u00f4ng th\u1ee9c v\u00e0 c\u00e1ch t\u00ednh th\u1ec3 t\u00edch h\u00ecnh c\u1ea7u<\/strong><\/p>\n – C\u00f4ng Th\u1ee9c T\u00ednh Th\u1ec3 T\u00edch H\u00ecnh C\u1ea7u, M\u1eb7t C\u1ea7u<\/em><\/p>\n V = 4\/3 x \u03c0 x r3<\/sup><\/strong><\/p>\n Trong \u0111\u00f3:<\/p>\n – r:\u00a0<\/strong>b\u00e1n k\u00ednh h\u00ecnh c\u1ea7u, m\u1eb7t c\u1ea7u<\/p>\n <\/p>\n Cho m\u1ed9t h\u00ecnh c\u1ea7u c\u00f3 b\u00e1n k\u00ednh n\u1ed1i t\u1eeb t\u00e2m O d\u00e0i 6cm. H\u1ecfi di\u1ec7n t\u00edch c\u1ee7a m\u1eb7t c\u1ea7u n\u00e0y l\u00e0 bao nhi\u00eau?<\/p>\n <\/p>\n \u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch m\u1eb7t c\u1ea7u, h\u00ecnh c\u1ea7u \u1edf tr\u00ean ta c\u00f3 b\u00e1n k\u00ednh r = 5cm. Suy ra di\u1ec7n t\u00edch m\u1eb7t c\u1ea7u n\u00e0y s\u1ebd b\u1eb1ng:<\/p>\n S = 4 x \u03c0 x r2<\/sup>\u00a0= 4 x \u03c0 x 62<\/sup>\u00a0= 1440 cm2<\/strong><\/p>\n \u0110\u00e1p \u00e1n sau khi t\u00ednh di\u1ec7n t\u00edch m\u1eb7t c\u1ea7u l\u00e0 1440\u00a0cm2<\/strong><\/p>\n <\/p>\n – V\u00ed d\u1ee5 c\u00e1ch t\u00ednh th\u1ec3 t\u00edch h\u00ecnh c\u1ea7u, m\u1eb7t c\u1ea7u:<\/p>\n \u00c1p d\u1ee5ng theo b\u00e0i to\u00e1n tr\u00ean nh\u01b0ng thay \u0111\u1ed5i gi\u00e1 tr\u1ecb b\u00e1n k\u00ednh n\u1ed1i t\u1eeb t\u00e2m O ra m\u1eb7t c\u1ea7u b\u1eb1ng 7cm. H\u1ecfi th\u1ec3 t\u00edch h\u00ecnh c\u1ea7u n\u00e0y b\u1eb1ng bao nhi\u00eau?<\/p>\n <\/p>\n Ta c\u00f3 r = 7cm. Khi \u00e1p d\u1ee5ng gi\u00e1 tr\u1ecb b\u00e1n k\u00ednh v\u00e0o c\u00f4ng th\u1ee9c t\u00ednh th\u1ec3 t\u00edch h\u00ecnh c\u1ea7u, ta c\u00f3.<\/p>\n V<\/strong>\u00a0= 4\/3 x \u03c0 x r3 = 4\/3 x \u03c0 x 73 =\u00a01436 cm3<\/sup><\/strong>\u00a0ho\u1eb7c\u00a014,36 m3<\/sup><\/strong><\/p>\n C\u00f4ng th\u1ee9c v\u00e0 c\u00e1ch t\u00ednh di\u1ec7n t\u00edch m\u1eb7t c\u1ea7u v\u00e0 th\u1ec3 t\u00edch h\u00ecnh c\u1ea7u, m\u1eb7t c\u1ea7u \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng kh\u00e1 nhi\u1ec1u trong c\u00e1c b\u00e0i to\u00e1n h\u00ecnh h\u1ecdc ph\u1ed5 bi\u1ebfn, bao g\u1ed3m ch\u1ec9 h\u00ecnh c\u1ea7u ho\u1eb7c h\u00ecnh c\u1ea7u n\u1ed1i v\u1edbi h\u00ecnh vu\u00f4ng ho\u1eb7c h\u00ecnh ch\u1eef nh\u1eadt. Trong \u0111\u00f3, c\u00f4ng th\u1ee9c t\u00ednh di\u1ec7n t\u00edch, th\u1ec3 t\u00edch h\u00ecnh c\u1ea7u, m\u1eb7t c\u1ea7u c\u00f3 m\u1ed1i t\u01b0\u01a1ng quan kh\u00e1 d\u1ec5 nh\u1eadn th\u1ea5y v\u1edbi c\u00f4ng th\u1ee9c t\u00ednh th\u1ec3 t\u00edch h\u00ecnh l\u1eadp ph\u01b0\u01a1ng, h\u00ecnh tr\u1ee5 ho\u1eb7c h\u00ecnh h\u1ed9p ch\u1eef nh\u1eadt.<\/p>\n N\u1ebfu b\u1ea1n \u0111\u00e3 t\u1eebng gi\u1ea3i c\u00e1c b\u00e0i to\u00e1n t\u00ednh th\u1ec3 t\u00edch h\u00ecnh l\u1eadp ph\u01b0\u01a1ng, h\u00ecnh tr\u1ee5, h\u00ecnh h\u1ed9p ch\u1eef nh\u1eadt h\u1eb3n \u0111\u00e3 bi\u1ebft, c\u00e1c lo\u1ea1i h\u00ecnh h\u1ecdc kh\u00f4ng gian n\u00e0y c\u00f3 nhi\u1ec1u c\u00e1ch t\u00ednh di\u1ec7n t\u00edch to\u00e0n ph\u1ea7n, xung quanh kh\u00e1c nhau. B\u00ean c\u1ea1nh \u0111\u00f3, khi c\u00e1c d\u1ea1ng h\u00ecnh n\u00e0y giao nhau, vi\u1ec7c li\u00ean k\u1ebft th\u00eam c\u00e1c c\u00e1ch t\u00ednh di\u1ec7n t\u00edch h\u00ecnh tr\u00f2n, h\u00ecnh vu\u00f4ng h\u00ecnh ch\u1eef nh\u1eadt r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 t\u00ecm ra \u0111\u00e1p \u00e1n cu\u1ed1i c\u00f9ng.<\/p>\n Tr\u00ean \u0110\u00e2y l\u00e0 T\u1ed5ng h\u1ee3p C\u00f4ng\u00a0 th\u1ee9c t\u00ednh th\u1ec3 t\u00edch h\u00ecnh c\u1ea7u v\u00e0 di\u1ec7n t\u00edch m\u1eb7t c\u1ea7u, c\u00e1c b\u1ea1n tham kh\u1ea3o nh\u00e9.<\/p>\n","protected":false},"excerpt":{"rendered":" T\u1ed4NG H\u1ee2P C\u00d4NG TH\u1ee8C TH\u1ec2 T\u00cdCH H\u00ccNH C\u1ea6U, DI\u1ec6N T\u00cdCH M\u1eb6T C\u1ea6U * C\u00f4ng th\u1ee9c v\u00e0 c\u00e1ch t\u00ednh di\u1ec7n t\u00edch m\u1eb7t c\u1ea7u – C\u00f4ng Th\u1ee9c T\u00ednh Di\u1ec7n T\u00edch M\u1eb7t C\u1ea7u:… <\/p>\n","protected":false},"author":1,"featured_media":5499,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[443],"tags":[],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/posts\/5496"}],"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\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/comments?post=5496"}],"version-history":[{"count":0,"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/posts\/5496\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/media\/5499"}],"wp:attachment":[{"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/media?parent=5496"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/categories?post=5496"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/onthitot.com\/wp-json\/wp\/v2\/tags?post=5496"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"\"](\"https:\/\/onthitot.com\/wp-content\/uploads\/2017\/12\/cong-thuc-tinh-the-tich-hinh-cau-dien-tich-mat-cau.jpg\")
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\n– d:\u00a0<\/strong>\u0111\u01b0\u1eddng k\u00ednh m\u1eb7t c\u1ea7u, h\u00ecnh c\u1ea7u<\/p>\nB\u00c0I T\u1eacP V\u1eacN D\u1ee4NG T\u00cdNH DI\u1ec6N T\u00cdCH M\u1eb6T C\u1ea6U, TH\u1ec2 T\u00cdCH H\u00ccNH C\u1ea6U<\/i><\/h3>\n
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