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不規則圖形的周界(凹)
Author:
WYC
GeoGebra
New Resources
判斷球體
兩位數加法
兩位數除以一位數（一）
找出對稱軸
【案例】圆柱体内放置一个大球六个小球
Discover Resources
分數的加法
三角函數
軌跡觀察---兩圓上線段中點
線性規劃
C60足球模型（多边形）
Discover Topics
Vectors
Equilateral Triangles
Similarity Transformation or Similarity
Plane Figures or Shapes
Secant Line or Secant