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quynhquynh0945601234
2 năm trước
Cho nửa (O) đường kính AB. Ax là tiếp tuyến (Ax và nửa đường tròn cùng 1 nửa mặt phẳng có bờ là AB). Lấy C thuộc Ax (C khác A) vẽ tiếp tuyến CM A) chứng minh rằng: ACMO nội tiếp B) Cho AC = 5cm, OA = 3cm. tính OC
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