dissection proof of the  Pythagorean theorem. This proof/figure is often (falsely) called "Stuhl der Braut" (bride's chair) in German literature
<a href="//commons.wikimedia.org/wiki/User:Kmhkmh" title="User:Kmhkmh">Kmhkmh</a>
CC BY 4.0
<span class="int-own-work" lang="en">Own work</span>