cho hình chóp S.ABC có đáy ABC là tam giác vuông cân tại B, AC=2a, SA vuông góc với mặt phẳng (ABC), M là trung  điểm AC, Góc SBA= 30 độ
   a) chứng minh BC vuông góc (SAB)
   b) Tính góc hợp bởi SM và (ABC)
   c) Tính d( AB, SC)

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