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:
star polygon interlaced.svg Interlaced form of star polygon Previously uploaded as to math utoronto ca starpolygonnonagram Converted from the following vector PostScript source code translate moveto setgray setlinewidth mul add exch def cos mul sin mul lineto for closepath gsave setgray setlinewidth stroke grestore