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Mathematics, 16.06.2021 21:50 Tinker2019
Cho hình chóp có đáy là tam giác đều cạnh , vuông góc với mặt phẳng đáy, góc giữa mặt phẳng và mặt phẳng đáy bằng . Diện tích của mặt cầu ngoại tiếp hình chóp bằng
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Cho hình chóp có đáy là tam giác đều cạnh , vuông góc với mặt phẳng đáy, góc giữa mặt phẳng và mặt p...
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