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phanguyen
2 năm trước
Cho hình chóp S.ABCD. ABCD là hình chữ nhật, AB = a, AD = a√3, AC giao BD tại O, SO =a, SO vuông góc với đáy. Tính góc giữa a, SC và (ABCD) b, SC và (SBD) c, SC và (SAD)
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