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定周长的正多边形面积变化规律（含圆）
Author:
张英华
Topic:
Area
GeoGebra
New Resources
國旗 (作圖步驟直接餵給 Claude)
算柱 (兩位數)
Earth with coastline
畫出對稱圖形
長方體平面投影 (Codex版)
Discover Resources
some pic
武陵210數學-三角函數教學使用（1）
start and end clock face
百度(改良版)
尺规作图_课本内容
黄金螺线
Discover Topics
Natural Numbers
Plane Figures or Shapes
LCM and GCD
Polygons
Centroid or Barycenter