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二等辺三角形の３本の線
Author:
中村俊哉
GeoGebra
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standingwave-plus
standingwave
正１７角形 作図 regular 17-gon
目で見る立方体の2等分
等積変形2
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正負の数
円と直線の関係（接線）
内積の交換法則と分配法則
The sum of the arithmetic progression
a 投影図(1)
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Volume
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