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perimeter
Author:
wongwk
,
Tim Brzezinski
GeoGebra
New Resources
第八周作业
找出對稱軸
拼砌四邊形
異分母分數減法
三位數除以一位數（一）
Discover Resources
翻轉方塊(雙開)
拋物面光學性質
Mathematics and Optics (and their applications)
拋物線1--焦點法
了解圓方程(1)的副本
Discover Topics
Vectors
Boxplot
Vectors 3D (Three-Dimensional)
General Quadrilateral
Geometric Mean