Posted by Jessica on .
If a circle has an area of 25 pi cm squared, find the circumference of the circle?
a. 5 squared cm
b. 10 squared cm
c. 50 sqaurred cm
d. 156.25 squared cm

geometry 
Steve,
a=pi*r^2
25pi = pi*r^2
25 = r^2
r = 5
so, c = 2pi*r = 10pi