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\begin{figure}[H]
\begin{minipage}[b]{0.5\linewidth}
\centering
\includegraphics[width=0.7\textwidth]{shapesrs1}
\subcaption{Example foundation with \(R=\frac{1}{\pi} \approx 0.32\)}
\end{minipage}
\begin{minipage}[b]{0.5\linewidth}
\centering
\includegraphics[width=0.7\textwidth]{shapesrs2}
\subcaption{\(\left. R_{RSmax}=\frac{B_{i}^2}{\pi r_{o}^2}\right\vert_{r_{o}=\frac{\sqrt{2}B_{i}}{2}}=\frac{2}{\pi}\approx0.64\)}
\end{minipage}
\caption{Ring foundations with central square perforation}
\end{figure}
Lukasz