Math homeowrk help? please?

Question

a circular swimming pool, 20 feet in diameter, is enclosed by a wooden deck that is 3 feet wide. What is the area of the deck? How much fence is required to enclose the deck?

Answer 1

The area of the deck=the outer area-the inner area=Pi(20/2+3)^2-Pi

(20/2)^2=Pi{13^2-10^2}=216.77ft ^2

the perimeter=26xPi=81.682 ft.

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