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五角形の内角の和

Author:伊藤秀雄

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standingwave-reflection-fixed
円の伸開線
standingwave-reflection-free
接点の作る円は内接円
正１７角形　作図　regular 17-gon

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２次関数の決定１
三角形の外心
デザルグの定理　視点の移動
算法天生法指南二之巻(61)解答
おうぎ形の性質ワークシート

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LCM and GCD
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Prism

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