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內公切線段長求法
Author:
謝易達
GeoGebra
New Resources
拼砌四邊形
錐體建築師
直角坐標平面上的旋轉變換
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
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圓圈圈
圓與兩平行切線
正八角錐(旋轉，實體、透視)
a sin(bx+c) + d 的圖形的副本
两次折叠
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Sequences and Series
Cylinder
Histogram
Complex Numbers
Equations