The surface area of a spherical lampshade is 57.76pi what is the radius from the lampshade

The area for a sphere is A=4*pi*r^2, so I think for a lampshade should be a semisphere, i mean a half of sphere, the area would be A = (4*pi*r^2) / 2

For your problem, solve for r and you will get r=root (57.76pi / (2pi))

r = 5.37

The radius is (by the way I am not sure) 181.458 ...