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平面の決定
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渡辺たけし
GeoGebra
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正１７角形 作図 regular 17-gon
接点の作る円は内接円
sine-wave
standingwave-reflection-free
カージオイド
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接線の長さ
ネイピア数
４次の対称群と交代群
三角形の回転
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Median Line
Hyperbola
Statistics
Integral Calculus
Perimeter