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固定周界的長方形的面積變化（周界是200厘米）
Author:
李寶玲
,
GeoGebra Institute of Hong Kong
GeoGebra
New Resources
判斷球體
球體建築師
画直线等分三角形的面积
兩組對邊相等的四邊形
球体的体积推导（优化版）
Discover Resources
高中二年級平面向量
量角器
Introduction to Rectangular Coordinates
靜態幾何錯視圖
旋轉圓弧
Discover Topics
Power Functions
Perimeter
Arithmetic Operations
Special Points
Pythagoras or Pythagorean Theorem