File:50th Quadrilateral.jpg
Please check the source to verify that this is correct. In particular, note that publication on the Internet, like publication by any other means, does not in itself imply permission to redistribute. Files without valid permission should be tagged with {{subst:npd}}.
Usage notes:
- If the work requires attribution, use {{Attribution}} instead.
- If this is your own work, please use {{Cc-zero}} instead.
