Cho chóp S.ABCD,đáy la hinh thang vuông tại A,B với BC là đáy nhỏ,..gọi H là trung điểm của AB,...tam giác SAB đều cạnh SA=2a ,,,(SAB)  vuông góc $(ABCD)$..$SC=a\sqrt{5}$... ,khoảng cách từ D đến mp (SHC) bằng $2a\sqrt{2}$.... Tính $VSABCD$ và $d(A,SCD)$ ..?

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