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三角形の重心（a center of gravity）
Author:
Takayuki Kamei
GeoGebra
New Resources
standingwave-reflection-free
sine-wave
正１７角形 作図 regular 17-gon
円の伸開線
直線の軌跡
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Ex_86
Fourie_01
円周率２
問題2－9 図3
２次関数の最大最小 のコピー
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Special Points
Cube
Dilation
Variance
Geometric Transformations