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动圆在定圆上滚动
Author:
yhf
GeoGebra
New Resources
直線的斜率：水平變化 & 鉛垂變化
祖冲之的期望：内棋与外棋
常见四边形是否是双心四边形
龙形曲线-分形龙2
撒针估算面积实验
Discover Resources
ggbbook1
三角
projection02 by Mr LO WY
因數（1至24）
題 3 的複本
Discover Topics
Congruence
Integral Calculus
Mathematics
Functions
Upper and Lower Sum or Riemann Sum