\[1)\ R = 4\ см:\]
\[S = \pi R^{2} = 16\pi\ см^{2}.\]
\[Ответ:\ \ 16\pi\ см^{2}.\]
\[2)\ d = 14\ дм:\]
\[S = \pi R^{2} = 196\pi\ дм^{2}.\]
\[Ответ:\ \ 196\pi\ дм^{2}.\]