$\"\"$

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.