\begin{tikzpicture}<1->[scale=0.75]
  \node[rectangle,draw,rotate=30,minimum height=22mm,minimum width=25mm,align=center] at (2,0) {$\mathbb{R}^n$ \\ Rowspace \\ of A};
  \node[rectangle,draw,rotate=-30,minimum height=22mm,align=center] at (8,0) {$\mathbb{R}^m$ \\ Columnspace \\ of A};
  \node (1) at (2.5,0.5) {};
  \node (2) at (8,0.5) {};
  \node at (5,1.3){A};
  \draw (1) edge[looseness=0.8,->] (2);
\end{tikzpicture}
