\begin{tikzpicture}
\umlsimpleclass{A}
\umlemptyclass[below left=2cm and 2cm of A, anchor=north]{B}
\umlclass[right=4cm of B.north, anchor=north]{C}{i : int \\ r : double}{}
\umlVHVinherit[arm2=-1.2cm]{B}{A}
\umlVHVinherit[arm2=-1.2cm]{C}{A}
\end{tikzpicture}