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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
四邊形的特性
三位數除以一位數（二）
兩位數除以一位數（一）
找出對稱軸
判斷球體
Discover Resources
HKCEE-AM 2006 Q17
Locus: Equidistance From Two Intersecting Lines
Tiling 2
二元线性规划的图解法(18.2 例4)
Copy of 圓周 (圖形F)
Discover Topics
Solids or 3D Shapes
Planes
Pie Chart or Circle Chart
Differential Calculus
Sine