Question

Find the area of a circle whose circumference is 8 pi m

Answer 1

area=pir^2
circumference=2pir

given
c=8pi
c=2pir
2pir=8pi
divide both sides by 2pi
r=4


area=pir^2
are=pi4^2
area=16pi

area=16pi square meters

Answer 2

C = $\pi$d
C = 8$\pi$
d = 2r
8 = 2r
r = 4

A = $\pi$$r^{2}$
A = $\pi$*$4^{2}$
A = 16$\pi$