Cho hình chóp S.ABCD có đáy ABCD là hình chữ nhật, AB=a,AD=a√2,ΔSAB cân tại S và (SAB)⊥(ABCD),(SAC) tạo với đáy góc 60o,H là trung điểm của AB.

    a) Tính thể tích khối chóp S.ABCD

    b) Tính bán kính mặt cầu ngoại tiếp S.AHC

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