Langley's Adventitious Angles

角度の問題でLangley's adventitious anglesというのがあるらしい．

https://en.wikipedia.org/wiki/Langley%27s_Adventitious_Angles
https://www.youtube.com/watch?v=w7CEmLTtPnc
https://www.youtube.com/watch?v=-p79EKHL6hc

小中学校程度の話でも難問はあることを思い知らされる例なり．
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