Question

Find the length or area. I need help with 11 pls

Answer 1

Given the formula of a portion of the circle

`A=\pi *r^2*(\theta)/(360)`

We are given that

`A=20\pi ft^2`
`\theta=72`

thus

`20\pi=\pi *r^2*(72)/(360)`

Solving for r

`20=r^2*(1)/(5)`
`r^2=5*20`
`r=√(100)`
`r=10`

then the radius of the circle is 10ft