An isosceles triangle in static equilibrium: with 4/9 of its area on a table, and 5/9 off the table.
<a href="//commons.wikimedia.org/wiki/User:Vinicius.314" title="User:Vinicius.314">Vinícius Machado Vogt</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>