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nammilo2003
2 năm trước
Cho hình thang ABCD . Gọi giao điểm cảu 2 đường chéo AC,BD là O. BIết OA=4cm, OC=8cm, AB=5cm a, Tính CD b, Qua O kẻ đường thẳng vuông góc với AB cắt AB và CD lần lượt tại H,K. Tính diện tích tam giác ABC? Biết OK=6cm c, Qua O kẻ đường thẳng // với AB cắt AD và BC lần lượt tại E và F. Cmr: AE/AD+CF/BC=1
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