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Helicoid
Author:
Jui-Tang Chen
Helicoid
GeoGebra
New Resources
兩組對邊相等的四邊形
【案例】2013年安徽高考15题
画直线等分三角形的面积
兩位數加法
三位數除以一位數（一）
Discover Resources
Primary Mathematics
對稱圖形
反演 (Inversion)的副本
百度
星形线-Astroid Curve-with-Envelope Command
Discover Topics
Rhombus
Square
Trigonometric Functions
Plane Figures or Shapes
Secant Line or Secant