\[R_{1} = 6\ см;R_{2} = 8\ см.\ \]
\[1)\ 15\ см:\]
\[R_{1} + R_{2} = 6 + 8 = 14;\]
\[R_{1} + R_{2} < 15.\]
\[Ответ:\ \ 0.\]
\[2)\ 14\ см:\]
\[R_{1} + R_{2} = 6 + 8 = 14;\]
\[R_{1} + R_{2} = 14.\]
\[Ответ:\ \ 1.\]
\[3)\ 10\ см:\]
\[R_{1} + R_{2} = 6 + 8 = 14;\]
\[R_{1} + R_{2} > 10.\]
\[R_{2} - R_{1} = 8 - 6 = 2;\]
\[R_{2} - R_{1} < 10.\]
\[Ответ:\ \ 2.\]
\[4)\ 2\ см:\]
\[R_{1} + R_{2} = 6 + 8 = 14;\]
\[R_{1} + R_{2} > 2.\]
\[R_{2} - R_{1} = 8 - 6 = 2.\]
\[Ответ:\ \ 1.\]