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Author:
赵林
GeoGebra
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兩組對邊相等的四邊形
算柱 (兩位數)
近似值：有效數字
找出對稱軸
四邊形的特性
Discover Resources
史坦納圓 (Steiner Circle)
硬幣
時鐘與數學
國旗1
摺長方形
Discover Topics
Functions
Orthocenter
Parabola
Differential Equation
Perimeter