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周界和面積
Author:
Tse Sir
GeoGebra
New Resources
找出對稱軸
近似值：有效數字
畫出對稱圖形
判斷球體
兩組對邊相等的四邊形
Discover Resources
平面幾何
圓周率的應用 題C
纏繞畫1
橢圓規Ellipsograph (Trammel of Archimedes)
完全图
Discover Topics
Coordinates
Geometric Mean
Area
Logic
Surface