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`