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Hứa cho ctlhn nhé Cho tam giác ABC có diện tích là 72cm2. Biết 1/12 cạnh đáy BC bằng 1/3 chiều cao AH hạ từ đỉnh A xuống đáy BC. a) Hãy tính chiều cao AH và đáy BC. b) Từ điểm M chính giữa cạnh BC vẽ đường song song với AB cắt AC ở N. Tính diện tích tam giác MNC.
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