Question

If the diameter of sphere is reduced by half, its surface becomes A. one-quarter the original surface. B. double the original surface. C. half the original surface. D. four times the original surface.

Answer 1

Surface area is 4*pie*r^2
If the diameter is reduced by half, radius is reduced by half
New radius is r’
r’ = r/2
So new area = 4*pie*r’^2 = pie * r^2
So A