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六上：圆的面积公式推导
Author:
钟秀群
Topic:
Circle
GeoGebra
New Resources
異分母分數減法
柱體建築師
拼砌四邊形
球体的体积推导（优化版）
四邉形 (四年級) 教師版
Discover Resources
畫三角形 題1a
Tessellations
分水問題
relations of pavlue fisher method
多边形旋
Discover Topics
Similarity Transformation or Similarity
Angles
Reflection
Scatter Plot
Tangent Function