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Thanhthu146
2 năm trước
Cho khối lăng trụ ABCA1B1C1 . CÓ đáy ABC là t giác vuông cân tại B . AB=a . Hình chiếu vuông góc A1 lên mặt phẳng ABC trùng với trung điểm H của tam giác AB góc giữa 2 mặt phẳng AA1C1C với ABC bằng 45 độ. Tính thể tích khối lăng trụ đã cho
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