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菲涅尔双面镜
Author:
Lee
GeoGebra
New Resources
異分母分數減法
四邊形的特性
球體建築師
兩位數加法
兩組對邊相等和有直角的四邊形
Discover Resources
Conic section
Angle in alternate segment
Copy of 随机模拟实验（撒豆子估算π）
圆的面积展开的副本
極線對偶定理 / polar duality theorem 的複本
Discover Topics
Mode
Quadrilaterals
Angles
Complex Numbers
Addition