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khanh2006
2 năm trước
Cho đường tròn tâm O, ĐK: BC, điểm A thuộc đường tròn. Vẽ BK: OK song song vs BA (K và A nằm trên cùng phía đối với BC). Tiếp tuyến với đường tròn O tại C cắt OK ở I, OI cắt AC tại H a) CM: Tam giác ABC⊥A b) CMR: IA là tiếp tuyến của đường tròn O c) Cho BC=30cm, AB=18cm, tính các độ dài OI,CI c) CMR: CK là phân giác của góc ACI
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