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2 năm trước
Cho hình chóp S.ABCD có đáy ABCD là hình thoi cạnh a, góc b bằng 120 độ. Mặt phẳng SAB là tam giác đều và nằm trong mặt phẳng vuông góc với đáy. Tính bán kính mặt cầu ngoại tiếp hình chóp SAB
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