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mizukimyrai
2 năm trước
Cho diem A nam ngoai duong tron (O) . Từ A ve hai tiep tuyen AB , AC và cát tuyen ADE a) Cm: ABOC noi tiep va AB^2 = AD.AE b) Cm: OA vuong goc BC va DHOE noi tiep c) Từ D vẽ tiếp tuyen voi (O) cắt AB , AC tại M và N , OM và ON lần lượt cắt BC tại I và K.Cm: Chu vi tam giac AMN = 2AB và OD , NI , MK đồng quy tại 1 điểm
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