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Angles associated with Parallel Lines 平行線上的角
Author:
Alex CHIK
GeoGebra
gMath 互動數學教室
http://www.gmath.hk
New Resources
錐體建築師
找出對稱軸
球体的体积推导（优化版）
兩位數除以一位數（二）
拼砌四邊形
Discover Resources
黎曼和
pictures
测试 = =
平行四邊形堆垛
圓錐曲線－圓錐截痕
Discover Topics
Trigonometric Functions
Square
Rectangle
Parametric Curves
Similarity Transformation or Similarity