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lethunh1973
2 năm trước
Cho tam giác ABC vuông tại A, đường cao AH. Biết AB = 3, AC =4. a) Tinh AH, BH ? a Chứng minh CB là tiếp tuyến của đường tròn (A, AH) c) Kẻ tiếp tuyến BI và CK với đường tròn (A, AH) (I, K là tiếp điểm). Chứng minh : BC = BI + CK và ba điểm I, A, K thắng hàng. Câu c bài 6 giải giúp mình với ạ!
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