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四角形の各辺の中点を結ぶと？
Author:
小山英憲
GeoGebra
New Resources
sine-wave
サイクロイド
直線の軌跡
正１７角形 作図 regular 17-gon
standingwave-reflection-fixed
Discover Resources
２次関数の決定２
GeoCon Problem 3.10 (Equilateral triangle on right angle)
角の二等分線と比 証明 3
極限と漸化式(limit)
垂直二等分線の作図
Discover Topics
Median Line
Square
Function Graph
Complex Numbers
Continuity