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正九邊形
Author:
李春培
正九邊形
GeoGebra
New Resources
找出對稱軸
兩位數除以一位數（一）
球体的体积推导
球体的体积推导（优化版）
兩位數加法
Discover Resources
斜率 - 概念及定義 (1)
gjh-g03-00 和的平方公式
重心
正投影
酷炫
Discover Topics
Bar Chart or Bar Graph
Trigonometry
Means
Plane Figures or Shapes
Coordinates