Mathematics, 31.07.2021 04:20 Tristabergeron5650
Cho hình chóp S. ABCD có ABCD là hình thang cân, AD//BC, AD=2BC=8a. Góc ABC=120 độ.Gọi o là trung điểm AD. SO vuông góc mp ABCD. Diểm M là trung điểm của cạnh SA. H là hình chiếu của M lên mặt phẳng (SBO). Độ dài MH bằng?
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Cho hình chóp S. ABCD có ABCD là hình thang cân, AD//BC, AD=2BC=8a. Góc ABC=120 độ.Gọi o là trung đi...
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