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r=200 ft

d= 400 ft

c= πd

= 3.14 x 400

c= 1256ft

a= πr²

= 40, 000.... (remember always do the indicies first because of B.I.D.M.A.S)

3.14 x 40, 000

AREA = 125, 600 ft²

:)

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