Mathematics, 29.11.2021 14:00 ramenbates81

Cho hình chóp SABCD có đáy ABCD là hình vuông cạnh a tâm O mặt bên SAB là tam giác đều và góc D bằng 90 độ Gọi d x là đường thẳng qua d và song song với SC giao điểm I của đường thẳng d x với mặt phẳng SAB diện tích thiết diện của hình chóp SABCD cắt bởi AC là

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Cho hình chóp SABCD có đáy ABCD là hình vuông cạnh a tâm O mặt bên SAB là tam giác đều và góc D bằng...

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