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anhksaa1
2 năm trước
Cho đường tròn (O) và điểm A nằm ngoài đường tròn. Từ điểm A kẻ hai tiếp tuyến AB và AC đến (O) (B,C là các tiếp điểm). Kẻ đường kính BD của đường tròn (O) . Đường thẳng đi qua O vuông góc với đường thẳng AD và cắt AD, BC lần lượt tại K,E. Gọi I là giao điểm của OA và BC. a, CMR: Các tứ giác `ABOC, AIKE` nội tiếp đường tròn. b, CMR: `OI.OA=OK.OE` c, Biết `OA=5cm`, đường tròn (O) có bán kính `R=3cm`. Tính độ dài đoạn thẳng BE.
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