geometry
posted by Jessica .
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

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