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正五角形の作図
Author:
Naofumi Horio
GeoGebra
New Resources
円の伸開線
standingwave-reflection
等積変形2
接点の作る円は内接円
standingwave-reflection-fixed
Discover Resources
（使用）中二一次関数動点p84
回転体4step468-1
円周角 for mobile(Angles at Circumference)
離心率
ラッキー７に近づこう
Discover Topics
Numbers
Curve Sketching
Distributions
Line Segment
Fractal Geometry