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truongngochanunl1
2 năm trước
Cho 3 điểm A,B,C cố định thẳng hàng theo thứ tự đó. Vẽ đường tròn đường kính AB. I là điểm cố định nằm giữa O và B. Vẽ dây EF của đường tròn(O), dây này thay đổi nhưng luôn đi qua I. Vẽ đt d vuông góc với AC tại C, AE cắt d tại P, AF cắt d tại Q. Vẽ đường tròn ngoại tiếp tam giác APQ cắt AC tại M. C/m a) PEFQ nt b)AIF~AQM c)AI.AM=AB.AC
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