Question 186759
Diameter = 20 yards 
radius r = 20/2 = 10 yards = 3 x 10 = 30 feet (since 3 ft = 1 yard)
Circumference =  2 pi r = 2 x 3.14 x 30 = 188.4 feet
Area = pi r^2  = 3.14 x 30 x 30 = 2827 sq. feet