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平行四邊形有甚麼特性？
Author:
Anthony OR 柯志明
Topic:
Parallelogram
English version:
http://ggbtu.be/m79826
GeoGebra
New Resources
兩組對邊相等的四邊形
兩位數除以一位數（二）
三位數除以一位數（二）
畫出對稱圖形
異分母分數減法
Discover Resources
三角函数图像变换动画演示
HW question locus 3
認識分數的副本
閱讀量杯
以 Unit Circle 了解 Sine 的正/負的副本
Discover Topics
Polygons
Probability
Stochastic Process or Random Process
Area
Random Variables