Circumference is 20 feet. What's the area?
Area = Pi x r^2, r=radius
Diameter =2r
Circumference = Diameter x Pi
20 = D x 3.141592
D = 20 / 3.141592
D = 6.366 feet.
r = 6.366 / 2
r = 3.183 feet.
Area =3.141592 x 3.183^2
Area = 31.829 sq. feet - the area of the circle.
