Answer
$$SA = 2,022,426,050 \ ft^2$$
Work Step by Step
The equation for the surface area of a cone is:
$$ SA=\pi r\times (\sqrt{h^2+r^2})$$
Plugging in the known values for radius and height, we find:
$$ SA=\pi (25,200\ ft)\times (\sqrt{4190^2+25200^2})$$
Simplifying:
$$ SA=25546 \times 79128 \ ft^2 \\ SA = 2,022,426,050 \ ft^2$$
