The circle circumscribed around the right trapeze
<a href="https://en.wikipedia.org/wiki/sr:%D0%9A%D0%BE%D1%80%D0%B8%D1%81%D0%BD%D0%B8%D0%BA:Sneza-95" class="extiw" title="w:sr:Корисник:Sneza-95">User:Sneza-95</a> and <a href="https://en.wikipedia.org/wiki/sr:%D0%9A%D0%BE%D1%80%D0%B8%D1%81%D0%BD%D0%B8%D0%BA:Ttijanaa" class="extiw" title="w:sr:Корисник:Ttijanaa">User:Ttijanaa</a>
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Work done by student, for EDU Wiki.