Author: <a href="https://en.wikipedia.org/wiki/User:Limaner" class="extiw" title="en:User:Limaner">en:User:Limaner</a>
<a href="//commons.wikimedia.org/wiki/User:WikedKentaur" class="mw-redirect" title="User:WikedKentaur">WikedKentaur</a>
2006-04-16
Own work based on: <span style="border:1px dotted #FC0;padding:0 4px"><a href="https://en.wikipedia.org/wiki/File:Trapezoid.svg" class="extiw" title="en:File:Trapezoid.svg">Trapezoid.svg</a></span>