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正二十面体
Author:
井蓋 美緒
GeoGebra
New Resources
対数螺旋
目で見る立方体の2等分
standingwave-reflection
カージオイド
standingwave-reflection-free
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散歩の数学
傍心三角形の垂心
立体 線分を動かして（①四角）
正四角錐
６章⑥三角柱の展開図
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Sequences and Series
Means
Plane Figures or Shapes
Distributions
Statistical Characteristics