Algebra
posted by Crystal on .
wht is the area of a circle with a circumference of 25 meters? I have to use pi(3.14) and round to the nearest square meter.

C = Circumference
A = Area
r = Radius
C = 2 r pi Divide both sides with 2 pi
C / 2 pi = r
r = C / 2 pi
A = r ^ 2 pi
A = ( C / 2 pi ) ^ 2 * pi
A = ( C ^ 2 / 4 pi ^ 2 ) * pi
A = C ^ 2 / 4 pi
A = 25 ^ 2 / 4 pi
A = 625 / ( 4 * 3. 14 )
A = 625 / 12.56
A = 49.761 m ^ 2
A = approx. 50 m ^ 2 
Thnx!!