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梯形有甚麼特性？
Author:
Anthony OR 柯志明
English version:
http://ggbtu.be/m79855
GeoGebra
New Resources
找出對稱軸
拼砌四邊形
【案例】2013年安徽高考15题
四邉形 (四年級) 教師版
三位數除以一位數（二）
Discover Resources
Triangular Number 三角形數
Ext angle cyclic quad
circle: line from centre
生长弧
作三角形
Discover Topics
Ratios
Scalene Triangles
Sphere
Vectors
Tangent Line or Tangent