\[a_{1} = 29{^\circ};\ \ \ \]
\[a_{2} = 169{^\circ};\]
\[C = 15\ 900\ км:\]
\[L = \frac{a_{2} - a_{1}}{360{^\circ}} \bullet C =\]
\[= \frac{169{^\circ} - 29{^\circ}}{360{^\circ}} \bullet 15\ 900 =\]
\[= \frac{7}{18} \bullet 15\ 900 \approx 6\ 200\ км.\]
\[Ответ:\ \ 6\ 200\ км.\]