squaring the circle physically, the cylinder with radius 1 gets filled water until the water reaches a height of h, then the water gets poured into a right angle prisma of length 4h, then the water's surface forms a rectangle with dimension 4h and <span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\sqrt {\pi }}}"><semantics><mrow class="MJX-TeXAtom-ORD"><mstyle displaystyle="true" scriptlevel="0"><mrow class="MJX-TeXAtom-ORD"><msqrt><mi>π<!-- π --></mi></msqrt></mrow></mstyle></mrow><annotation encoding="application/x-tex">{\displaystyle {\sqrt {\pi }}}</annotation></semantics></math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/7ae18ec124928c74818b516e6350ca9610966c6e" class="mwe-math-fallback-image-inline" aria-hidden="true" style="vertical-align: -1.005ex; width:3.268ex; height:3.009ex;" alt="{\displaystyle {\sqrt {\pi }}}"></span>
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