A <a href="https://en.wikipedia.org/wiki/nine-point_circle" class="extiw" title="w:nine-point circle">nine-point circle</a>. Made with the free Java software Compass and Ruler (short <a href="https://en.wikipedia.org/wiki/C.a.R." class="extiw" title="w:C.a.R.">C.a.R.</a>).
<a href="//commons.wikimedia.org/wiki/User:Erina" title="User:Erina">Erina</a>
2006-08-30
<span class="int-own-work" lang="en">Own work</span>