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梯形有甚麼特性？
Author:
Anthony OR 柯志明
GeoGebra
New Resources
球体的体积推导
兩組對邊相等的四邊形
異分母分數減法
兩位數除以一位數（一）
判斷球體
Discover Resources
七巧板貓咪
Add and subtract (binary)
共垂心
平行四邊形的面積
外资知名
Discover Topics
Sine
Scalene Triangles
Secant Line or Secant
Reflection
Boxplot