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任意凸多边形的滚动
Author:
赵林
GeoGebra
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第八周作业
找出對稱軸
判斷球體
畫出對稱圖形
球体的体积推导（优化版）
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clock
三角函數圖形
面積
二元线性规划的图解法(18.2 例4)
中考专题-等腰三角形与旋转-求角度专项-D-1
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Trapezoid
Secant Line or Secant
Translation
Scalene Triangles
Congruence