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三角形の重心（a center of gravity）
Author:
Takayuki Kamei
GeoGebra
New Resources
対数螺旋
コイン投げと樹形図
カージオイド
目で見る立方体の2等分
sine-wave
Discover Resources
等式の証明
動点問題
n等辺n角形
立体射影の等角写像
Chapter4_1a
Discover Topics
Solids or 3D Shapes
Division
Differential Calculus
Multiplication
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