C\u0169ng nh\u01b0 quan h\u1ec7 song song trong kh\u00f4ng gian, quan h\u1ec7 vu\u00f4ng g\u00f3c trong kh\u00f4ng gian r\u1ea5t quan trong. Trong ph\u1ea7n n\u00e0y, ch\u00fang ta s\u1ebd bi\u1ebft \u0111\u01b0\u1ee3c th\u1ebf n\u00e0o l\u00e0 \u0111\u01b0\u1eddng th\u1eb3ng vu\u00f4ng g\u00f3c v\u1edbi m\u1eb7t ph\u1eb3ng, m\u1eb7t ph\u1eb3ng vu\u00f4ng g\u00f3c v\u1edbi m\u1eb7t ph\u1eb3ng\u2026, v\u00e0 \u0111i\u1ec1u ki\u1ec7n g\u00ec m\u00e0 ta c\u00f3 \u0111\u01b0\u1ee3c nh\u1eefng \u0111i\u1ec1u \u0111\u00f3, c\u00e1c ph\u01b0\u01a1ng ph\u00e1p x\u00e1c \u0111\u1ecbnh kho\u1ea3ng c\u00e1ch t\u1eeb \u0111i\u1ec3m \u0111\u1ebfn m\u1eb7t ph\u1eb3ng, kho\u1ea3ng c\u00e1ch gi\u1eefa 2 \u0111\u01b0\u1eddng th\u1eb3ng ch\u00e9o nhau.<\/p>\n

M\u1ed9t s\u1ed1 l\u00fd thuy\u1ebft \u0111\u01b0\u1ee3c tr\u00edch ra t\u1eeb t\u00e0i li\u1ec7u<\/p>\n

+) \u0110\u1ecbnh ngh\u0129a 5<\/em><\/strong>:<\/p>\n

. N\u1ebfu \u0111\u01b0\u1eddng th\u1eb3ng a vu\u00f4ng g\u00f3c v\u1edbi m\u1eb7t ph\u1eb3ng (\u03b1) th\u00ec ta n\u00f3i r\u1eb1ng g\u00f3c gi\u1eefa \u0111\u01b0\u1eddng th\u1eb3ng a v\u00e0 m\u1eb7t ph\u1eb3ng (\u03b1) b\u1eb1ng 90^{0<\/sup>.<\/p>\n}

. N\u1ebfu \u0111\u01b0\u1eddng th\u1eb3ng a kh\u00f4ng vu\u00f4ng g\u00f3c v\u1edbi m\u1eb7t ph\u1eb3ng (\u03b1) th\u00ec g\u00f3c gi\u1eefa a v\u00e0 h\u00ecnh chi\u1ebfu a\u2019 c\u1ee7a n\u00f3 tr\u00ean m\u1eb7t ph\u1eb3ng (\u03b1) g\u1ecdi l\u00e0 g\u00f3c gi\u1eefa \u0111\u01b0\u1eddng th\u1eb3ng a v\u00e0 m\u1eb7t ph\u1eb3ng (\u03b1).<\/p>\n

+) \u0110\u1ecbnh ngh\u0129a 6<\/em><\/strong>: G\u00f3c gi\u1eefa hai m\u1eb7t ph\u1eb3ng l\u00e0 g\u00f3c gi\u1eefa hai \u0111\u01b0\u1eddng th\u1eb3ng l\u1ea7n l\u01b0\u1ee3t vu\u00f4ng g\u00f3c v\u1edbi hai m\u1eb7t ph\u1eb3ng \u0111\u00f3.<\/p>\n

+) \u0110\u1ecbnh ngh\u0129a 7<\/em><\/strong>: Kho\u1ea3ng c\u00e1ch t\u1eeb \u0111i\u1ec3m M \u0111\u1ebfn m\u1eb7t ph\u1eb3ng (\u03b1) (ho\u1eb7c \u0111\u1ebfn \u0111\u01b0\u1eddng th\u1eb3ng \u2206) l\u00e0 kho\u1ea3ng c\u00e1ch gi\u1eefa hai \u0111i\u1ec3m M v\u00e0 H, trong \u0111\u00f3 H l\u00e0 h\u00ecnh chi\u1ebfu vu\u00f4ng g\u00f3c c\u1ee7a M tr\u00ean m\u1eb7t ph\u1eb3ng (\u03b1) (tr\u00ean \u0111\u01b0\u1eddng th\u1eb3ng \u2206).<\/p>\n

+) \u0110\u1ecbnh ngh\u0129a 8<\/em><\/strong>: Kho\u1ea3ng c\u00e1ch gi\u1eefa \u0111\u01b0\u1eddng th\u1eb3ng a \u0111\u1ebfn m\u1eb7t ph\u1eb3ng (\u03b1) song song v\u1edbi a l\u00e0 kho\u1ea3ng c\u00e1ch t\u1eeb m\u1ed9t \u0111i\u1ec3m n\u00e0o \u0111\u00f3 c\u1ee7a a \u0111\u1ebfn m\u1eb7t ph\u1eb3ng (\u03b1).<\/p>\n

+) \u0110\u1ecbnh ngh\u0129a 9<\/em><\/strong>: Kho\u1ea3ng c\u00e1ch gi\u1eefa hai m\u1eb7t ph\u1eb3ng song song l\u00e0 kho\u1ea3ng c\u00e1ch t\u1eeb m\u1ed9t \u0111i\u1ec3m b\u1ea5t k\u1ef3 c\u1ee7a m\u1eb7t ph\u1eb3ng n\u00e0y \u0111\u1ebfn m\u1eb7t ph\u1eb3ng kia.<\/p>\n

+) \u0110\u1ecbnh ngh\u0129a 10<\/em><\/strong>: Kho\u1ea3ng c\u00e1ch gi\u1eefa hai \u0111\u01b0\u1eddng th\u1eb3ng ch\u00e9o nhau l\u00e0 \u0111\u1ed9 d\u00e0i \u0111o\u1ea1n vu\u00f4ng g\u00f3c chung c\u1ee7a hai \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u00f3.<\/p>\n

<\/p>\n

Xem th\u00eam t\u1ea1i: http:\/\/toanhoc247.com\/phuong-phap-va-cac-dang-toan-ve-quan-he-vuong-goc-trong-khong-gian-rat-hay-a5127.html#ixzz4XxtqEO3c<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

C\u0169ng nh\u01b0 quan h\u1ec7 song song trong kh\u00f4ng gian, quan h\u1ec7 vu\u00f4ng g\u00f3c trong kh\u00f4ng gian r\u1ea5t quan trong. Trong ph\u1ea7n n\u00e0y, ch\u00fang ta s\u1ebd bi\u1ebft \u0111\u01b0\u1ee3c th\u1ebf n\u00e0o l\u00e0 \u0111\u01b0\u1eddng th\u1eb3ng vu\u00f4ng g\u00f3c v\u1edbi m\u1eb7t ph\u1eb3ng, m\u1eb7t ph\u1eb3ng vu\u00f4ng g\u00f3c v\u1edbi m\u1eb7t ph\u1eb3ng\u2026, v\u00e0 \u0111i\u1ec1u ki\u1ec7n g\u00ec m\u00e0 ta c\u00f3 \u0111\u01b0\u1ee3c nh\u1eefng \u0111i\u1ec1u \u0111\u00f3, […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[172],"tags":[],"yoast_head":"\n