Question

How long is the arc subtended by an angle of 7π/5 radians on a circle of radius 25 cm?

Answer 1

`\bf \textit{arc's length}\\\\ s=r\theta \quad \begin{cases} r=radius\\ \theta =angle~in\\ \qquad radians\\ ------\\ r=25\\ \theta =(7\pi )/(5) \end{cases}\implies s=25\cdot (7\pi )/(5)\implies s=35\pi`