Question

For the following find the length of the arc and sector area:

pi = 3.14

Arc Length =

Sector Area =

Answer 1

`\textit{arc's length}\\\\ s = r\theta ~~ \begin{cases} r=radius\\ \theta =\stackrel{radians}{angle}\\[-0.5em] \hrulefill\\ r=9\\ \theta =(2\pi )/(3) \end{cases}\implies s=(9)\cfrac{2\pi }{3}\implies s=(9)\cfrac{2(3.14) }{3}\implies s=18.84 \\\\[-0.35em] ~\dotfill`

`\textit{area of a sector of a circle}\\\\ A=\cfrac{\theta r^2}{2} ~~ \begin{cases} r=radius\\ \theta =\stackrel{radians}{angle}\\[-0.5em] \hrulefill\\ r=9\\ \theta =(2\pi )/(3) \end{cases}\implies A=\cfrac{2\pi }{3}\cdot \cfrac{9^2}{2} \\\\\\ A=\cfrac{2(3.14) }{3}\cdot \cfrac{9^2}{2}\implies A=84.78`