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[几何] 转载自纯几何吧的角格点问题

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hbghlyj posted 2021-1-19 18:28 |Read mode
Last edited by hbghlyj 2021-1-19 18:38∠DFE=∠BFC=19°,∠ECD=30°,∠ACF=41°,∠CBD=8°,∠EBF=38°,∠AEF=11°,∠BEC=22°,求证∠EAF=19°.
2012292347f81100939ca84aa5.png
转载自纯几何吧的这帖的21楼
我用GeoGebra重新画了一个图,附件如下
$type 角格点 zjm.ggb (23.31 KB, Downloads: 2635)
附上题目的作者的知乎,以表达我的崇敬之情.

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