Question

find the volume of a right circular cylinder whose height is 20 cm and diameter of base is 14 cm.

Answer 1

h=20 d=14 so r=7
vol of cylinder=22/7 x 7 x 7 x 20
                      =154 x 20
                      =3080cm3

Answer 2

volume of cylinder=pi r^2 h
  =pi*7*7*20
  =22*7*20
 =3080 cm^3