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Huong131200lala
2 năm trước
Cho hình chóp S.ABCD có đáy ABCD là hình thang vuông tại A,D. SA vuông góc với mật phẳng (ABCD). Cho biết AD=CD=a,AB=2a ,hai mặt phẳng (SBC),(ABCD) tạo với nhau góc 45°. Khoảng cách từ điểm D đến mặt phẳng (SBC) bằng.
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