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改变单位圆验证2
Author:
lzp80
GeoGebra
New Resources
多邊形的面積
三位數除以一位數（二）
球体的体积推导
空间中两直线的位置关系
【案例】圆柱体内放置一个大球六个小球
Discover Resources
縫衣針
旋轉對稱
congruent triangle_provided by Mr Yeung Kar Chun
相似而不断变化的正多边形.许兴华数学
CBTL_science_rcpet
Discover Topics
Subtraction
Perimeter
Unit Circle
Frequency Distribution
Division