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Answer 1 · 2017-11-17T16:10:37

#8 feet#

the circumference formula

#C=pid#

#d=#the diameter

so

#8cancel(pi)=cancel(pi)d#

#d=8 feet#

Answer 2 · 2017-11-17T16:16:42

The diameter is 8 feet

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.