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扇形滚动(圆心角半径可变)
Author:
赵林
GeoGebra
New Resources
画直线等分三角形的面积
球體建築師
球体的体积推导
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
Discover Resources
Sum of Interior Angles of Polygons 多邊形內角和
四心的變化II
餘弦函數y=cos(x)的泰勒級數
三角形三边关系
祖冲之的期望：内棋与外棋
Discover Topics
Linear Functions
Sine
Pie Chart or Circle Chart
Median Value
Histogram