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內切圓滾動更新
Author:
李春培
內切圓滾動更新
GeoGebra
New Resources
第八周作业
兩位數加法
兩組對邊相等的四邊形
兩位數除以一位數（一）
找出對稱軸
Discover Resources
第12届美国中学生数学邀请赛题
雙曲線之極偶 / polarity for hyperbola
動態正方形(未完成)
二進位翻牌
特殊角三角函数值
Discover Topics
Quadrilaterals
Inequalities
Secant Line or Secant
Unit Circle
Variance