Mathematics, 23.07.2021 05:20, kanonhuffmanp3rnmy

Cho hình chóp S. ABCD, có đáy là hình vuông cạnh a, mặt bên (SAB) là tam giác đều, SC = a√2 . Gọi H, K lần lượt là trung điểm của AB, AD a. Chứng minh rằng SH vuôn góc với mặt đáy
b. Chứng minh rằng AC vuông góc với SK và CK vuông góc với SD.

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Cho hình chóp S. ABCD, có đáy là hình vuông cạnh a, mặt bên (SAB) là tam giác đều, SC = a√2 . Gọi H,...

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