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ngavuctb
2 năm trước
cho đường tròn OR từ điểm A nằm ngoài O vẽ 2 tiếp tuyến AB và AC với đường tròn (B,C là tiếp điểm ). OA cắt BC tại H, Kẻ dây CD song song với AB. Nối AD cắt O tại điểm thứ 2 là E, CE cắt AB tại I a) Cm 4 điểm ABOC cùng thuộc 1đường tròn b) AB2= AE.AD
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