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Cho tam giác ABC có góc A nhọn . Ve ra phia ngoài tam giác dđó các tam giác ABM, ACN vuông cân tại A BN và MC cat nhau tại D. a) Chứng minh: AAMC= AABN. b) Chứng minh: BN 1 CM. c) Cho MB = 3cm, BC 2em, CN 4cm. Tinh MN. d) Chứng minh rằng DA là phân giác của góc MDN.
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