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五角形の内角の和

Author:伊藤秀雄

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standingwave-reflection
sine-wave
カージオイド
接点の作る円は内接円
コイン投げと樹形図

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球と経線の見え方
Design ruler 7
チャレンジ神戸
数学Ⅲ分数不等式③
与えられた線分を一辺とする正方形

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Cone
Unit Circle
Pythagoras or Pythagorean Theorem
Surface
Dilation

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