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ngochanxp2
2 năm trước
cho đường trong(O;R); một đường thẳng d cắt đường tròn tại A và B lấy điểm C thược d sao cho B nằm giữa A và C từ giữa P của cung lớn AB kẻ đường kính PQ cắt AB tại D,CP cắt (O) tại điểm thứ hai I.Giao điểm của AB và IQ là K a)chứng minh PDKI nội tiếp b)chứng minh CI.CP=CK.CD c)chứng minh IC là phân giác ngoài của tam giác AIB Giúp mình với ạ
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