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２つの正三角形
Author:
Tsuyoshi Yamamoto
GeoGebra
New Resources
standingwave-reflection-free
standingwave-plus
サイクロイド
カージオイド
目で見る立方体の2等分
Discover Resources
Copy of 面積比
（使用）中一円錐回転体p186
作図(練習30(2))
区分求積法２
双曲線の面積の性質
Discover Topics
Rotation
Mathematics
Numbers
Solids or 3D Shapes
General Quadrilateral