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九点円 (Euler's Circle)
Author:
増井 貴明 / Takaaki Masui
GeoGebra
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正１７角形 作図 regular 17-gon 2
円の伸開線
目で見る立方体の2等分
standingwave-plus
斜めドップラー
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Rettangolo aureo
第２章例題１０
楕円の接線三角形と極線
１次方程式の利用（往復）
p75 例7
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Parallelogram
Statistics
Conic Sections
Geometric Transformations
Numbers