材料:切弦亦称切点弦,是一条特殊弦,从圆外一点向圆引两条切线,此时,圆心与已知点的连线垂直平分切弦.
证明:为了说明切弦性质的正确性,补充证明过程.
已知:如图,P是外一点, ,
求证: .
证明:
更新时间:2023-12-09 20:54:18
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