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正9邊形
Author:
李春培
正9邊形
GeoGebra
New Resources
找出對稱軸
球体的体积推导（优化版）
三位數除以一位數（一）
判斷球體
球体的体积推导
Discover Resources
平移旋轉對稱
拋物線的參數
Angles in a Circle:Property 2
除法Q5
利用海龟来趣味演示三角形三边的关系
Discover Topics
Quadrilaterals
Sine
Hypothesis Testing
Cosine
Right Triangles