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2 năm trước
Cho hình chóp S ABCD . có đáy là hình vuông cạnh a , cạnh bên SA vuông góc với mặt phẳng đáy và SA a √2 Mặt phẳng ( P) qua A và vuông góc với SC . Tính diện tích theo a diện tích của thiết diện tạo bởi và hình chóp S ABCD
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