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圆的内接正多边形
Author:
吕胜
GeoGebra
New Resources
常见四边形是否是双心四边形
双心四边形
三角函数 的副本
撒针估算面积实验
斐波那契螺旋弧线（表格法-可动态调节）
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畢氏定理動畫
正n邊形
Features from Vertex form
正方形中的45度摺紙
小四_小數的認識
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Logarithmic Functions
Trigonometry
Percentages
Trigonometric Functions
Parallelogram