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Pi by Ramanujan

$$\begin{align} \frac{9}{5}\;+\;\sqrt{\frac{9}{5}}\;&=\;|\overline{AB}|+|\overline{AC}| \\ &=\;|\widehat{AB^\prime}|+|\widehat{AC^\prime}| \\ &\approx\;|\stackrel{\frown}{AB^\prime}|+|\stackrel{\frown}{AC^\prime}| \\ &=\;|\stackrel{\frown}{B^\prime C^\prime}| \\[4pt] &\approx\;\pi \end{align}$$

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