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六上练习：时钟轨迹问题
Author:
肖昆明
GeoGebra
New Resources
平行線的判定
龙形曲线-分形龙
斐波那契螺旋弧线（表格法）
折扣
比較五件物件的重量
Discover Resources
盒子的體積
a sin(bx+c) + d 的圖形
Angles between 2 planes
極座標方程式
小正多边形在大正多边形内的滚动（边长不相等）
Discover Topics
Perimeter
Parametric Curves
Upper and Lower Sum or Riemann Sum
Similar Triangles
Quadratic Functions