SOLUTION: How do I find the circumference of a circle when I only know the area? I know the area is 64pi miles^2. How do I use that information to find the circumference? Also is

Question 717014: How do I find the circumference of a circle when I only know the area?

I know the area is 64pi miles^2. How do I use that information to find the circumference?

Also is the 64 the radius or the diameter?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
The formula for area is

You can solve this for radius

You are given that
, so

---------
The formula for circumference is

answer

RELATED QUESTIONS
How do I find the perimeter of a rectangle that's in a circle when all I know is the... (answered by ikleyn,greenestamps)

How do I find the area of a rectangle if I only know the perimeter and the... (answered by stanbon)

how do I find the radius when the area of a circle is... (answered by macston)

How do I figure out the smallest surface area of a cylinder when I only know what the... (answered by KMST)

How do I calculate the area of a right triange when I only know the length of its... (answered by MathLover1)

how do I find the area of a donut when I only have the radius of the outer circle?... (answered by dabanfield,richwmiller)

how do i find the area of a circle (answered by solver91311)

How do i find the height of a parallelogram if i know the base and... (answered by jim_thompson5910)

A circle is inacribed in a square of area 4 . What will be the area of the circle? I do... (answered by Alan3354)