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binhcoi15483
1 năm trước
cho tam giác abc cân tại a trên tia đối bc lấy điểm m .trên tia đối cb lấy điểm n sao cho bm bằng cn bh vuông góc với am .ck vuông góc với an. gọi o là giao điểm cua hb và ck a) chứng minh rằng tam giác amn cân b) bh = ck c)ah= ak d)tam giác obc là tam giác j ?vì sao giúp mình với mình vote 5 sao
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