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nguyenthiphuongthao525
2 năm trước
Cho hình chóp S.ABCD đáy ABCD là hình vuông tâm O và tất cả các cạnh bên, cạnh đáy đều bằng nhau. Khẳng định nào sau đây là đúng? A. SO vuông (ABCD) B. SA vuông (ABCD) C. BC vuông (SAB) D. CD vuông (SAD)
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