Bài 3 (3 ?i?m): 1. (2 ?i?m) Cho \(\triangle AMN\) vuông t?i A, có AM = 3cm và AN = 4cm. V? ???ng cao AD c?a \(\triangle AMN\) a) Ch?ng minh: \(\triangle AMN \) ??ng d?ng \(\triangle ADMA\) b) Tính MN, MD c) Ch?ng minh: \(AD^2 = DM.DN\) 2. (1 ?i?m) Tính di?n tích c?a m?t tam giác ??u có ?? dài c?nh b?ng 8 cm.
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