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紙に正方形の穴を開ける２
Author:
Naofumi Horio
GeoGebra
New Resources
sine-wave
正１７角形 作図 regular 17-gon
standingwave-reflection-free
目で見る立方体の2等分
円の伸開線
Discover Resources
根軸の交点（根心）
傍心と内心
中点三角形
等積変形 p139 例題1
放物線の接線の性質
Discover Topics
Arithmetic Operations
Quadrilaterals
Special Points
Set Theory
Fractal Geometry