Cho hình chóp S.ABCD có SA vuông góc với đáy và đáy là hình thang cân có đáy lớn AD gấp đôi đáy nhỏ BC, đồng thời cạnh bên AB bằng đáy nhỏ.Biết BC-a,SA=2a.Khi đó khoảng cách từ A đến (SCD) là bao nhiêu

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