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三角函数：单位圆与函数图象
Author:
acchu
GeoGebra
New Resources
画直线等分三角形的面积
球体的体积推导
畫出對稱圖形
兩位數除以一位數（二）
拼砌四邊形
Discover Resources
小四小數
極坐標
對稱-釘板-Student
劉徽的「割圓術」的副本
组合体的表面积1
Discover Topics
Optimization Problems
Statistical Characteristics
Parametric Curves
Pie Chart or Circle Chart
Prism