这道关于圆外切四边形等角线的题，是否有纯几何法证明？ 知乎 Sketch Coloring Page

这道关于圆外切四边形等角线的题，是否有纯几何法证明？ 知乎 Template

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tomski这道关于圆外切四边形等角线的题，是否有纯几何法证明？ 知乎 coloring

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