cho hình chóp SABCD có đáy ABCD là hình vuông, tâm O. SA vuông (ABCD). kẻ AH vuông SB tại H, AK vuông SD tai K. cho AB=a, SC=a5√. goi G là trong tâm \triangle  SAC.
a) CM các mặt bên của hình chóp là tam giac vuông.
b) CM AH vuông(SBC), SC vuông AK, (SAC) vuông (AHk)
c)cm Hk vuông (SAC)
http://hoctainha.vn/tin-tuc/trac-nghiem-vui/59/yen-sida-dai-duong-khong-v-u

bị xóa vì không liên quan đến nội dung của site bởi ๖ۣۜDevilღ 09-06-16 05:40 PM

Câu hỏi này hoàn toàn không liên quan đến nội dung của site.

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