Nh\u00e0 th\u01a1 n\u1ed5i ti\u1ebfng th\u1eddi \u0110\u01b0\u1eddng l\u00e0 V\u01b0\u01a1ng Chi Ho\u00e1n, trong b\u00e0i th\u01a1 \u201cL\u00ean l\u1ea7u qu\u00e1n t\u01b0\u1edbc\u201d1 \u0111\u00e3 vi\u1ebft:<\/p>\n\n\n\n
M\u1eb7t tr\u1eddi \u0111\u00e0 g\u00e1c n\u00fai Ho\u00e0ng h\u00e0 nh\u1eadp bi\u1ec3n kh\u01a1i Luy\u1ec7n t\u1ea7m nh\u00ecn thi\u00ean l\u00ed D\u1ea5n th\u00eam m\u1ed9t t\u1ea7ng l\u1ea7u.<\/p>\n\n\n\n
Trong b\u00e0i th\u01a1 c\u00f3 n\u00f3i \u201cthi\u00ean l\u00ed\u201d l\u00e0 c\u00e1ch n\u00f3i khoa tr\u01b0\u01a1ng, \u00fd n\u00f3i l\u00e0 c\u00f3 t\u1ea7m nh\u00ecn xa. Th\u1ebf nh\u01b0ng n\u1ebfu b\u1ea1n c\u00f3 h\u1ee9ng th\u00fa b\u1ea1n th\u1eed t\u01b0\u1edfng t\u01b0\u1ee3ng \u0111\u1ec3 c\u00f3 t\u1ea7m nh\u00ecn thi\u00ean l\u00ed – t\u1ea7m nh\u00ecn ng\u00e0n d\u1eb7m (500 km) ta th\u1eed xem ph\u1ea3i l\u00ean to\u00e0 nh\u00e0 c\u00f3 bao nhi\u00eau t\u1ea7ng, cao bao nhi\u00eau?<\/p>\n\n\n\n
Theo nh\u01b0 h\u00ecnh v\u1ebd, gi\u1ea3 s\u1eed \u0111\u1ea1i di\u1ec7n cho m\u1eb7t \u0111\u1ea5t, 0 l\u00e0 trung t\u00e2m Tr\u00e1i \u0110\u1ea5t, C l\u00e0 \u0111i\u1ec3m c\u00e1ch A 500000 m, d\u0129 nhi\u00ean ng\u01b0\u1eddi \u0111\u1ee9ng t\u1ea1i \u0111i\u1ec3m A s\u1ebd kh\u00f4ng nh\u00ecn th\u1ea5y \u0111i\u1ec3m C, m\u00e0 mu\u1ed1n nh\u00ecn th\u1ea5y \u0111i\u1ec3m C th\u00ec b\u1eaft bu\u1ed9c ph\u1ea3i t\u1eeb \u0111i\u1ec3m B \u1edf xa m\u1eb7t \u0111\u1ea5t. Tia nh\u00ecn BC c\u00f3 li\u00ean quan ch\u1eb7t ch\u1ebd v\u1edbi cung AC, AB ch\u00ednh l\u00e0 t\u1ea7ng l\u1ea7u c\u00f3 chi\u1ec1u cao th\u1ea5p nh\u1ea5t m\u00e0 \u0111\u1ee9ng t\u1eeb \u0111\u00f3 c\u00f3 th\u1ec3 quan s\u00e1t th\u1ea5y \u0111i\u1ec3m C.<\/p>\n\n\n\n
V\u00ec AB = OB – OA, OA l\u00e0 b\u00e1n k\u00ednh Tr\u00e1i \u0110\u1ea5t v\u00e0 b\u1eb1ng 6370 km, n\u00ean \u0111\u1ec3 t\u00ednh AB ta ch\u1ec9 c\u1ea7n t\u00ednh OB.<\/p>\n\n\n\n
Trong tam gi\u00e1c vu\u00f4ng OCB<\/p>\n\n\n\n
V\u00e0<\/p>\n\n\n\n
AB = OB – OA = 6390 km – 6370 km = 20 km<\/p>\n\n\n\n
T\u1eeb c\u00e1c t\u00ednh to\u00e1n cho th\u1ea5y \u00edt nh\u1ea5t th\u00ec to\u00e0 l\u00e2u \u0111\u00e0i c\u0169ng cao \u0111\u1ebfn 20 km, cao h\u01a1n \u0111\u1ec9nh n\u00fai cao nh\u1ea5t th\u1ebf gi\u1edbi l\u00e0 \u0111\u1ec9nh Ch\u00f4m\u00f4lungma (t\u1ee9c \u0111\u1ec9nh Evrest) nhi\u1ec1u. T\u1ea7ng l\u1ea7u cao \u0111\u1ebfn nh\u01b0 v\u1eady qu\u1ea3 l\u00e0 ch\u01b0a t\u1eebng c\u00f3.<\/p>\n\n\n\n
T\u1eeb kho\u00e1: T\u1ea7m nh\u00ecn thi\u00ean l\u00ed.<\/p>\n\n\n\n
<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
Nh\u00e0 th\u01a1 n\u1ed5i ti\u1ebfng th\u1eddi \u0110\u01b0\u1eddng l\u00e0 V\u01b0\u01a1ng Chi Ho\u00e1n, trong b\u00e0i th\u01a1 \u201cL\u00ean l\u1ea7u qu\u00e1n t\u01b0\u1edbc\u201d1 \u0111\u00e3 vi\u1ebft: M\u1eb7t tr\u1eddi \u0111\u00e0 g\u00e1c n\u00fai Ho\u00e0ng h\u00e0 nh\u1eadp bi\u1ec3n kh\u01a1i Luy\u1ec7n t\u1ea7m nh\u00ecn thi\u00ean l\u00ed D\u1ea5n th\u00eam m\u1ed9t t\u1ea7ng l\u1ea7u. Trong b\u00e0i th\u01a1 c\u00f3 n\u00f3i \u201cthi\u00ean l\u00ed\u201d l\u00e0 c\u00e1ch n\u00f3i khoa tr\u01b0\u01a1ng, \u00fd n\u00f3i l\u00e0 c\u00f3 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[15,9],"tags":[],"class_list":["post-7541","post","type-post","status-publish","format-standard","hentry","category-hoi-dap-khoa-hoc","category-toan-hoc"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7541","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=7541"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/7541\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=7541"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=7541"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=7541"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}