\[\boxed{\mathbf{736\ (736).}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[S = \pi r^{2} \Longrightarrow \ \ \ \ r^{2} = \frac{S}{\pi}\text{\ \ \ \ }\]
\[r = \sqrt{\frac{S}{\pi}} = \sqrt{\frac{314}{3,14}} = \sqrt{\frac{31400}{314}} =\]
\[= \sqrt{100} = 10\ см.\]