Question

Question #ec141

Answer 1

`8 feet`

Explanation:

the circumference formula

`C=pid`

`d=`the diameter

so

`8cancel(pi)=cancel(pi)d`

`d=8 feet`

Answer 2

The diameter is 8 feet

Explanation:

If you don't know already, circumference is equal to double the radius times pi.

`c=2*r*pi`

The diameter is just double the radius, so...

`c=d*pi`

Plugging this in-

`8pi=d*pi`

Using algebra, we divide both sides by pi.

`8=d`

Or- plug this in with the radii

`8pi=2*r*pi`
/2
`4pi=r*pi`
/`pi`
4=r

Since diameter is double radius, then

8 = d

The first method is easier and saves you time.