Question

I need help with this question please help

Answer 1

282.857 in²

Explanation:

The formula of a surface area of a cylinder:

`S.A.=2\pi r^2+2\pi rH`

r - radius

H - height

We have:

r = 5 in

H = 4 in

Substitute:

`S.A.=2\pi(5^2)+2\pi(5)(4)=2\pi(25)+2\pi(20)\\\\=50\pi+40\pi=90\pi\ in^2`

`\pi\approx(22)/(7)`

Substitute:

`S.A.\approx90\cdot(22)/(7)=(1980)/(7)\approx282.857\ in^2`