Mathematics, 25.07.2021 21:50, cruzc2

Cho hình lăng trụ ABC. A'B'C' có đáy là tam giác đều cạnh a, hình chiếu của A lên (A'B'C') là trung điểm I' của cạnh B'C', mặt bên BCC'B' là hình thoi. a/ tính khoảng cách (ABC) và (A'B'C')

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Cho hình lăng trụ ABC. A'B'C' có đáy là tam giác đều cạnh a, hình chiếu của A lên (A'B'C') là trung...