\[\boxed{\mathbf{2.2}\mathbf{72}}\]
Пояснение.
Решение.
\[S = a^{2};\ \ \ a = \frac{5}{16}\ \ см.\]
\[S = \left( \frac{5}{16} \right)^{2} = \frac{5}{16} \cdot \frac{5}{16} = \frac{5 \cdot 5}{16 \cdot 16} =\]
\[= \frac{25}{256}\text{\ \ }\left( см^{2} \right).\]
\[Ответ:\frac{25}{256}\ см^{2}\text{.\ }\]