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正二十面体の展開図
Author:
Tetsuya Akazawa
GeoGebra
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正１７角形 作図 regular 17-gon
standingwave-plus
standingwave-reflection
接点の作る円は内接円
目で見る立方体の2等分
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六角形の包絡線
円錐の切断⇒楕円
乱数が３個のχ二乗分布
Sigmoidもどき①
三平方の定理の証明（ピタゴラス）
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Angles
Probability
Linear Programming or Linear Optimization
Median Line
Subtraction