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多边形旋
Author:
赵林
GeoGebra
New Resources
兩位數加法
判斷球體
兩組對邊相等和有直角的四邊形
球体的体积推导（优化版）
畫出對稱圖形
Discover Resources
橢圓軌跡 (3)
面積3轉正三角形
growth
Epicycloid
关于椭圆的一个性质
Discover Topics
Hyperbola
Hypothesis Testing
Piecewise Functions
Arithmetic Operations
Special Points