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拉伸平行四边形，面积变化
Author:
吕玉雷
GeoGebra
New Resources
畫出對稱圖形
四邉形 (四年級) 教師版
近似值：有效數字
Claude 解幾何題
四邊形的特性
Discover Resources
塗鴉
平行線 (同位角 - 4對)
兩位小數GAME
hello
兩圓位置關係及公切線
Discover Topics
Cylinder
Random Experiments
Perimeter
Difference and Slope
Centroid or Barycenter