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tonvanthanh.lk
2 năm trước
Cho nửa đường tròn o có bán kính AB= 2R . Kẻ tia Ax cắt tiếp tuyến tại A với nửa đường tròn. lấy điểm C trên tia Ax sao cho AC> R. CB cắt nửa đường tròn O tại M . Qua A kẻ đường thẳng vuông góc với CO tại I. Tia AI cắt nửa đường tròn O tại D 1) chứng minh tứ giác AIMC nội tiếp 2) chứng minh tam giác ADM đồng dạng với tam giác CBO 3) Qua D kẻ DH vuông góc với AB tại H . DH cắt CB tại K . chứng minh góc IMK bằng góc ADH và K _ trung điểm DH giúp mik vs mng ơi
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