Surface area of a sphere is 2464 cm2. If its radius is doubled, then the surface area of the new sphere will be	Pick.
A) 4920 cm2  B) 4727 cm2  C) 9856 cm2  D) 19712 cm2  E) None
Sol.   Let the original radius be r.   Then, original surface area = 4Πr2 = 2464 cm2(given).   New radius = 2r.   ∴ New surface area = 4Π (2r)2   = 4 x 4Πr2   = (4x2464) cm2   = 9856 cm2   Answer 9856 cm2
<result>C</result>
Surface area of a sphere is 2464 cm2. If its radius is doubled, then the surface area of the new sphere will be