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双対多面体(正二十面体，正十二面体）

Author:久保塾　今治

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接点の作る円は内接円
standingwave-reflection
円の伸開線
小テスト
平均変化率

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温度計
３円内側A1と３円外側の中心B1
例２円錐の展開図
透明半球
GHS5616

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Square
Integers
Parallelogram
Equilateral Triangles
Means

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