\[1)\ Левый\ отрезок:\]
\[tg\ 68{^\circ} = \frac{130}{l_{1}}\]
\[l_{1} = \frac{130}{tg\ 68{^\circ}} = 130\ ctg\ 68{^\circ} =\]
\[\approx 130\ tg\ 22{^\circ} \approx 130 \bullet 0,4040 \approx\]
\[\approx 52,52\ (м).\]
\[2)\ Правый\ отрезок:\]
\[tg\ 46{^\circ} = \frac{130}{l_{2}};\]
\[l_{2} = \frac{130}{tg\ 46{^\circ}} = 130\ ctg\ 46{^\circ} =\]
\[\approx 130\ tg\ 44{^\circ} \approx 130 \bullet 0,9657 \approx\]
\[\approx 125,54\ (м).\]
\[3)\ Длина\ моста:\]
\[l = l_{1} + l_{2} =\]
\[= 130(tg\ 22{^\circ} + tg\ 44{^\circ}) \approx\]
\[\approx 52,52 + 125,54 \approx 178\ (м).\]
\[Ответ:\ \ \]
\[130(tg\ 22{^\circ} + tg\ 44{^\circ}) \approx 178\ м.\]