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Given that Circumference of a great circle(C) = feet.
Circumference:
(Substitute )
(Divide each side by 2)
(Cancel common terms)
Surface area:
(Surface area of a sphere)
(Substitute )
(Evaluate powers)
(Simplify)
(Substitute )
(Divide: )
The surface area is approximately 290.4 square feets.
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