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Author:
Yan Dongtai（严东泰）
GeoGebra
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垂直線的斜率
圓周公式的應用
祖冲之的期望：内棋与外棋
【案例】2013年安徽高考15题
平行線的斜率
Discover Resources
複數等比級數
判斷球體 5
周界
三角函數的由來
測試繪本
Discover Topics
Upper and Lower Sum or Riemann Sum
Pythagoras or Pythagorean Theorem
Cosine
Centroid or Barycenter
Prism