Circumference = diameter x PI
Circumference = 3.14 x 68 yards = 213.52 yards.
Area = PI x r^2
r = 1/2 the diameter = 1/2 x 68 = 34 yards.
Area = 3.14 x 34^2 = 3.14 x 1156 = 3629.84 yards^2
