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ブーメラン型（凹四角形）
Author:
Shinya Yokobayashi
GeoGebra
New Resources
standingwave
二次曲線と離心率
正１７角形 作図 regular 17-gon 2
サイクロイド
sine-wave
Discover Resources
Angles on a Straight Line
垂直二等分線の作図
垂線の性質
複素数の内分点・外分点
同位角 錯角
Discover Topics
Angles
Ratios
Conic Sections
Mathematics
Rectangle