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正N边形在圆内的滚动
Author:
孟宝兴
GeoGebra
New Resources
直線的斜率
龙形曲线-分形龙2
直線的斜率：水平變化 & 鉛垂變化
圓的基本性質
祖冲之的期望：内棋与外棋
Discover Resources
小數在數線上的位置
GGB5_3D:展開圖
testing
过圆上一点作切线，三步
test
Discover Topics
Sequences and Series
Parallelogram
Vectors
Rhombus
Random Experiments