\[\boxed{\mathbf{740\ (740).}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ l_{1} = 2\pi r = 2\pi \cdot 6 = 12\pi\]
\[l_{2} = 2\pi r = 2\pi \cdot 2 = 4\pi\]
\[\frac{l_{1}}{l_{2}} = \frac{12\pi}{4\pi} = 3\]
\[Ответ:в\ 3\ раза.\]
\[2)\ l_{1} = 2\pi \cdot 4r\]
\[l_{2} = 2\pi r\]
\[\frac{l_{1}}{l_{2}} = \frac{2\pi \cdot 4r}{2\pi \cdot r} = 4\]
\[Ответ:в\ 4\ раза.\ \]