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固定周界長方形的面積變化（三）
Author:
Anthony OR 柯志明
,
GeoGebra Institute of Hong Kong
Topic:
Area
,
Perimeter
,
Rectangle
GeoGebra
New Resources
柱體建築師
兩位數除以一位數（一）
錐體建築師
球体的体积推导（优化版）
兩組對邊相等的四邊形
Discover Resources
國旗
zuiduan
面鏡的反射
相位角、頻率
公因數
Discover Topics
Kite
Plane Figures or Shapes
Function Graph
Real Numbers
Conditional Probability