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duongbt42
2 năm trước
Lm giùm mk câu c Cho(O).Một điểm A nằm ngoài đường tròn .Vẽ tiếp tuyến AB,AC. a,Chứng minh tứ giác ABOC nội tiếp b,Cho R=3,OA=5.Tính BC c,Gọi K là đường tròn qua A và tiếp xúc với đường thẳng BC tại C .Đường tròn (O) và đường tròn (K) cắt nhau tại điểm thứ hai là M.Cm:BM đi qua trung điểm của AC
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