Answer:
Area of the hole = 113.10 sq. m.
Area of the sidewalk = 299.36 sq. ft.
Step-by-step explanation:
Area of the hole = pi x r^2
r = diameter/2 = 12/2 = 6
Area = pi x 6^2 = 3.1416 x 6^2 = 113.10//
Area of the sidewalk = area of the larger circle minus area of the smaller circle
Getting the radius of the circles
radius of the larger circle = (28 + 3.5 + 3.5)/2 = 17.5//
radius of the smaller circle = 28/2 = 14//
Area of the larger circle = 3.1416 x 17.5^2 = 962.115//
Area of the smaller circle = 3.1416 x 14^2 = 615.7536//
Area of the sidewalk = 962.115 - 615.7536 = 299.3614//
