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三角形の重心（a center of gravity）
Author:
Takayuki Kamei
GeoGebra
New Resources
sine-wave
standingwave-reflection-fixed
standingwave-reflection
接点の作る円は内接円
standingwave-reflection-free
Discover Resources
複素数平面
等角変形
加法定理の証明 2-4A
鳩の巣原理_正方形（分割あり）
どんな四角形になる？
Discover Topics
General Quadrilateral
Arithmetic Mean
Optimization Problems
Prism
Interest Calculation