Euler diagram of some types of quadrilaterals with labels in Macedonian.
original by <a href="//commons.wikimedia.org/wiki/User:Cmglee" title="User:Cmglee">Cmglee</a><br>derivative by <a href="//commons.wikimedia.org/wiki/User:Bjankuloski06" title="User:Bjankuloski06">B. Jankuloski</a>
CC BY-SA 4.0
<a href="//commons.wikimedia.org/wiki/File:Euler_diagram_of_quadrilateral_types.svg" title="File:Euler diagram of quadrilateral types.svg">File:Euler diagram of quadrilateral types.svg</a>