This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Hypocycloid.svg Hypocycloid with Created with Inkscape ban leprogramozsa forrskd using System using System Collections Generic using System ComponentModel using System Data using System Drawing using System Drawing DrawingD using System Text using System Windows Forms namespace WindowsApplication public partial class Form Form Graphics