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2 năm trước
Cho tam giác ABC vuông tại A có AB=3cm, AC=4cm. Vẽ đường cao AH. a) cm AB.AC=AH.BC. b) tính BC,AH. c) qua H vẽ HM vuông góc AB, HN vuông góc AC. Chứng minh AMHN là hcn. d) gọi I là trung điểm của AH. cm 3 điểm M,I,N thẳng hàng Giúp mình với các bạn. Mình đang cần gấp
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