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Author:
艳er
GeoGebra
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圓周公式的應用
探究三角形的全等條件
画直线等分三角形的面积
平行線的斜率
球体的体积推导（优化版）
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Trigonometric Ratios: Sine 三角比：正弦
面積2
多边形对角线
同餘
旋转的台阶
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Scalene Triangles
Complex Numbers
Trigonometry
Polygons
Linear Programming or Linear Optimization