Question

What is the arc length when Θ = 4 pi over 7 and the radius is 5 cm?

Answer 1

$\bf \textit{arc's length}\\\\ s=r\theta \qquad \begin{cases} r=radius\\ \theta =angle~in\\ \qquad radians\\ ------\\ r=5\\ \theta =\frac{4\pi }{7} \end{cases}\implies s=5\cdot \cfrac{4\pi }{7}$