13 From a cylindrical object of diameter 70 cm and height 84 cm, a right solid cone having its
base as one of the circular ends of the
cylinder and height 84 cm is removed.
Calculate
a) the volume of the remaining solid object
expressing your answer in the form
a X 10" where l<a<10 and n is a positive
integer
b) the surface area of the remaining solid
object.