Positioning subfigures

Question

I would like to position three subfigures like this:

(a) (b)
(a) (c)

Figure (a) on the first roll and figures (b) and (c) on the second. Some light, please?

Thanks in advance.

Answer 1

That it is. Thanks.

\begin{figure}[ht!]
    \center 
    \begin{subfigure}{0.45\textwidth}
      \includegraphics[width=\textwidth]{F1.png}
      \caption{F1}
      \label{fig:f1}
    \end{subfigure}
    \begin{subfigure}{0.45\textwidth}
      \begin{subfigure}{\textwidth}
         \includegraphics[width=\textwidth]{F2.png}
          \caption{F2}
          \label{fig:f2}
      \end{subfigure}
      \begin{subfigure}{\textwidth}
        \includegraphics[width=\textwidth]{F3.png}
        \caption{F3}
        \label{fig:f3}
      \end{subfigure}
    \end{subfigure}
\caption{How to do it}
\label{fig:howtodoit}
\end{figure}