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三角形の重心（a center of gravity）
Author:
Takayuki Kamei
GeoGebra
New Resources
standingwave-reflection
円の伸開線
正１７角形 作図 regular 17-gon 2
接点の作る円は内接円
サイクロイド
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傍斜術 ３円
外接円は傍心三角形の九点円
Q4-6
tlotc
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Pie Chart or Circle Chart
Optimization Problems
Arithmetic
Mode
Piecewise Functions