Question

радиус r=15. угол окружности=40° КАКОВА ДЛИНА ДУГИ?

Answer 1

$\gamma = 40° = \frac{2}{9} \pi \\ \gamma = \frac{c}{r} = > \frac{2\pi}{9} = \frac{c}{15} < = > c = \frac{30\pi}{9} = \frac{10}{3}\pi$