Question 1148876
Area of the square: 90^2 = 8100 square feet
Area of the circumference: (520/2)^2 x 3.14 = 212264 square feet

a) Amount of area covered by grass, measured in square feet = 212264 - 8100 = 204164

b) Amount of area covered by grass, measured in square yards = 204164/3 = 68054.67