Question

A cylinder had a base diameter of 8in and a height of 20in. What is the volume in cubic in, to the nearest tenths place?

Answer 1

1005.30

Explanation:

h=20d=8

identify variables

r=

r=

\,\,4

4

radius is half of the diameter

V=

V=

\,\,\pi r^2h

πr

2

h

use volume of a cylinder formula

V=

V=

\,\,\pi(4)^2(20)

π(4)

2

(20)

substitute variables into formula

V=

V=

\,\,1005.30964915

1005.30964915

multiply

V=

V=

\,\,1005.3\text{ in}^3

1005.3 in

3

Answer 2

=1004.8 in^2

Explanation:

The volume of a cylinder is given by

V = pi r^2 h

We have the diameter of 8

r = d/2 = 8/2 =4

= 3.14 * 4^2 *20

=1004.8 in^2