\[S_{кв} = a^{2} = 36\ см^{2} \Longrightarrow a = 6\ см\]
\[S_{кв} = b^{2} = 4\ см^{2} \Longrightarrow b = 2\ см\]
\[\frac{a}{b} = \frac{6}{2} = 3\ (р).\]
\[Ответ:в\ 3\ раза.\]