Computation of circle's square <a href="https://en.wikipedia.org/wiki/Cavalieri%27s_principle" class="extiw" title="en:Cavalieri's principle">Methods of indivisibles</a>. Legend:<br> R - radius;<br> L - circumference length;<br> S - square of the circle.
<a href="//commons.wikimedia.org/wiki/User:Kaidor" title="User:Kaidor">Kaidor</a>
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