Illustration of the moment of inertia of a annulus.
<a href="//commons.wikimedia.org/wiki/User:Mrmw" title="User:Mrmw">Mrmw</a>
<p><span class="int-own-work" lang="en">Own work</span>
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<ul><li><a href="https://en.wikipedia.org/wiki/c:special:permalink/539557577#Flat_annulus_in_a_simple_perspective" class="extiw" title="w:c:special:permalink/539557577">Special<i><b>:</b></i>Permalink/539557577</a></li></ul>