Firstly, calculate for the radius from the given circumference. The equation for circumference (C) is,
C = 2πr ; r = C/2π
Substituting the given circumference,
r = 50ft/2π = 25/π ft
The area for the solving the surface area of a sphere is calculated through the equation,
SA = 4πr² = 4π(25/π)² = 795.77 ft²
Therefore, the surface area is approximately 795.77 ft².