8) Найдите значение v.

Сумма углов треугольника равна 180 градусов. \[116^{\circ} + 58^{\circ} + (3v+1)^{\circ} = 180^{\circ}\] \[174 + 3v + 1 = 180\] \[3v + 175 = 180\] \[3v = 180 - 175\] \[3v = 5\] \[v = \frac{5}{3} = 1\frac{2}{3}^{\circ}\] Ответ: \[v = 1\frac{2}{3}^{\circ}\]