Cevi triangla.
<a href="https://en.wikipedia.org/wiki/sl:User:TamaMer" class="extiw" title="w:sl:User:TamaMer">TamaMer</a> at <a href="https://en.wikipedia.org/wiki/sl:" class="extiw" title="w:sl:">Slovenian Wikipedia</a>
<span class="int-own-work" lang="en">Own work</span>