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三角形の内角と外角の二等分線
Author:
Junichi Kawamura
GeoGebra
New Resources
正１７角形 作図 regular 17-gon
standingwave-reflection-free
二次曲線と離心率
standingwave-reflection-fixed
フーリエ級数展開
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正四面体の内接球の半径
hue 2
回転体（②円）
アニメ（馬と人）
内心
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Parallelogram
Sequences and Series
Constructions
Kite
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