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angle sum of polygon
Author:
Felix Yip Wing Chung
GeoGebra
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斜率的值
圓的基本性質
圓的切線方程
平行線的判定
正方形雪花图案
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動態面積展示
kevin
尋找三角形的內切圓
旋轉圓弧62326 劉虹圻
圆的面积展开的副本
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Intersection
Cone
Fractal Geometry
Translation
Integers