Your town is building a circular ice rink with a diameter of 100 feet. Around the ice rink will be a walkway that is 10 feet wide. What is the approximate area of the walkway?

Answer 1

the area of the walkway is the whole area minus just the rink, so that's

πR^2-πr^2 = π(R^2-r^2) = π((50+10)^2-50^2) = π(60^2-50^2) = π(3600-2500) = 1100π ft^2