Mathematics, 12.08.2021 04:50 latresyn
Cho hình chóp Sabcd có đáy abc là tam giác đều cạnh a. Cạnh bên Sa vuông góc với mặt đáy (ABC),góc giữa hai mặt phẳng (Sbc) và (abc) bằng 60 độ .Tìm thể tích V của khối chóp Sabc theo a
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Cho hình chóp Sabcd có đáy abc là tam giác đều cạnh a. Cạnh bên Sa vuông góc với mặt đáy (ABC),góc g...
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