Question

A cylinder has a circumference of 16pi inches and a height of 20 inches. what is the surface area of a cylinder in square inches?

Answer 1

1407.43

Explanation:

The eqaution for surface area of a cylinder is 2πr+2π
`r^(2)`'

but you already got the circumference so you work backwards

16pi/pi=16

16/2=8

r=8

h=20

So you plug it into the eqaution

2π8*20+2π8^2=1407.43