分段函数

[洋葱] 勾股定理(几何原本)

Cylinder Illusion

GeoGebra version adapted from [url=http://ggbm.at/Us5sbQVs]http://ggbm.at/Us5sbQVs[/url] by [url=https://www.facebook.com/sosolong.kuan]Kuan Chang-Sou (官長壽)[/url]

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