Three <a href="https://en.wikipedia.org/wiki/concurrent_lines" class="extiw" title="w:concurrent lines">concurrent</a> straight lines in a 2D Cartesian co-ordinate system.
<a href="//commons.wikimedia.org/wiki/User:Krishnavedala" title="User:Krishnavedala">Krishnavedala</a>
2013-01-17
<span class="int-own-work" lang="en">Own work</span>