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垂徑定理
Author:
eyun306
GeoGebra
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斐波那契螺旋弧线（表格法-可动态调节）
正方形雪花图案
比較五件物件的重量
龙形曲线-分形龙
折扣
Discover Resources
謝爾賓斯基三角形
座標
angle at centre vs angle at circumference
start and end clock face
圓例9
Discover Topics
Sine
LCM and GCD
Hyperbola
Means
Parabola