The outer edge of the roof has a radius of 225 feet, and the inner edge of the roof has a radius of 110 feet.
how many square yards of roof are required on a roundhouse that occupies 220 degrees of a circle?
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Step 1. Calculate the area of the ring in square yards:
pi (225^2 - 110^2)(1/3)^2 yd^2
Step 2. Calculate the fractional part of the ring:
(220/360) pi (225^2 - 110^2)(1/3)^2 = 8218.077 yd^2 <==Answer