Question 199049
The area of a circle is 16pie. What is its circumference?
:
Use the area of a circle formula to find the radius (r):
 {{{pi*r^2}}} = A
 {{{pi*r^2}}} = {{{16pi}}}
divide both sides by pi
 {{{r^2}}} = 16
Find the square root of both sides
r = {{{sqrt(16)}}}
r = 4
:
The circumference formula:
{{{C = 2*pi*r}}}
{{{C = 2*pi*4}}}
c = 25.1327