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三角四星
Author:
吳秉沂
GeoGebra
New Resources
Earth with coastline
sanjiaohanshu
算柱 (兩位數)
近似值：有效數字
兩組對邊相等和有直角的四邊形
Discover Resources
平行四邊形與菱形的分別
圓面積的展開
Dizzy (Just for Fun)
函数作图工具的副本
学用数学（分季）
Discover Topics
Intersection
Volume
Trapezoid
Percentages
Means