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六上：圆的面积公式推导
Author:
钟秀群
Topic:
Circle
GeoGebra
New Resources
球體建築師
四邉形 (四年級) 教師版
拼砌四邊形
【案例】2013年安徽高考15题
柱體建築師
Discover Resources
Animacja (kółka)
TRY_4.11.2016
泰北2017GGB研習
平行四邊形面積的副本
自製工具：CurveFit, Bezier
Discover Topics
Line Segment
Coordinates
Incircle or Inscribed Circle
Translation
Natural Numbers