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Bài 1: Cho hình thang ABCD, góc A = D = 90 độ Hai đường chéo vuông góc với nhau tại O. Biết OB = 5,4cm; OD = 15cm. a) Tính diện tích hình thang; b) Qua O vẽ một đường thẳng song song với hai đáy, cắt AD và BC lần lượt tại M và N. Tính độ dài MN. Bài 2: Cho tam giác nhọn ABC. Ba đường cao AD, BE, CF cắt nhau tại H. Trên các đoạn thẳng HA, HB, HC lần lượt lấy các điểm M, N, P sao cho góc BMC = CNA = APB = 90 độ Chứng minh rằng các tam giác ANP, BMP và CMN là những tam giác cân. mình đang cần rất gấp ạh, hứa vote 5 sao
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