为什么抛物线内接三角形的垂心是焦点时三角形内切一个定圆？ 知乎 Sketch Coloring Page

为什么抛物线内接三角形的垂心是焦点时三角形内切一个定圆？ 知乎 Template

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sketch #4974 Eminem by Juan Garcia

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sketch #3398 Sharingan by حيرتني بصمتها

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