\begin{tikzpicture}
\umlsimpleclass{A}
\umlemptyclass[x=-2, y=-3]{B}
\umlclass[x=2, y=-3]{C}{i : int \\ r : double}{}
\umlVHVinherit{B}{A}
\umlVHVinherit{C}{A}
\end{tikzpicture}