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三角形の角の二等分線と比

Author:田中利則

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正１７角形　作図　regular 17-gon 2
standingwave-reflection-free
接点の作る円は内接円
sine-wave
カージオイド

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Ex_59
点から線面立体
理念的な共通弦
単位円と動径
分度器と角の大きさ

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Reflection
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