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dhieu0368
2 năm trước
Cho tam giác ABC vuông tại A (AB<AC)Đường cao AH .Từ H vẽ HE và HF lần lượt vuông tại AB và AC a). Cm: AH = EH b)trên tia FC lấy K sao cho FK= Af tứ giác EFKH là hình j vì sao C) với BC=5cm , AC=4cm.tính diện tích tam giác ABC D)gọi I là trung điểm BC .Cm AI ⊥ È
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