SOLUTION: What is the area of a circle with the circumference 18 pi centimeters??

Question 145659: What is the area of a circle with the circumference 18 pi centimeters??
Found 2 solutions by edjones, jim_thompson5910:
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
A=pi*r^2
C=pi*d
d=C/pi
d=18pi/pi
d=18 cm
r=18/2=9
pi*9^2=81pi cm^2 area of the circle
.
Ed

Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!

Start with the circumference of a circle formula

Plug in (this is given)

Divide both sides by to solve for "r"

Reduce

So the radius of a circle with a circumference 18 pi centimeters is 9 cm

Plug in

Square to get

So the area is which is approximately 254.47 cm
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