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圆与椭圆
Author:
李大地(Field Lee)
GeoGebra
New Resources
直角坐標平面上的旋轉變換
兩組對邊相等的四邊形
四邊形的特性
找出對稱軸
兩位數除以一位數（一）
Discover Resources
圓交與公切線
柯西不等式 (2)
How to draw an octagon with ruler and compasses?
畢氏定理-切割法
幾何板
Discover Topics
Sequences and Series
Kite
Exponential Functions
Confidence Interval
Geometric Mean