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kibur3421
2 năm trước
Cho tam giác nhọn ABC có BAC = 45 độ. Đường tròn tâm O và đường kính BC cắt AB và AC lần lượt tại D và E. Gọi H là giao điểm của CD và BE, K là trung điểm của AH. Chứng minh: a) AE = BE b) 4 điểm A, D, H, E thẳng hàng c) OE là tiếp tuyến của đường tròn ngoại tiếp tam giác ADE
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