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長方形
Author:
Yin Kelvin Wong
GeoGebra
New Resources
兩位數加法
兩組對邊相等的四邊形
三位數除以一位數（一）
異分母分數減法
畫出對稱圖形
Discover Resources
HKMO 2008 Question 3 Demonstration (Geometric Construction)
gyzel 橢圓的反射
平移
摺長方形
求直角三角形的斜邊
Discover Topics
Tangent Function
Coordinates
Plane Figures or Shapes
Bar Chart or Bar Graph
Standard Deviation