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生活中的平面圖形關係─相似
Author:
Galen_1
GeoGebra
New Resources
画直线等分三角形的面积
兩位數加法
拼砌四邊形
球体的体积推导（优化版）
算柱 (兩位數)
Discover Resources
Symmetric 設計對稱圖案(一條對稱軸)(垂直)
Time
taiwan 2018
線的面畫
test
Discover Topics
Orthocenter
Correlation
Circle
Incircle or Inscribed Circle
Centroid or Barycenter