You can put this solution on YOUR website!
The volume of a sphere is
, so the volume of the scoop of ice cream, presuming a VERY TIDY person serving the ice cream who invariably makes his/her ice cream scoops into absolutely perfect spheres, is
(If the diameter is 4.2, the radius must be 2.1). The volume of a right circular cone is 1/3 that of a right circular cylinder with the same base radius and height, so
. For the given cone:
. Don't forget to take some napkins.