The common radius is half the diameter, which is three centimeters. The volume of the toy is the sum of the volume of the hemisphere, which is two by three pi r cubed, and the volume of the cone, which is one by three pi r squared h. Substituting the values gives the total volume as two by three pi times three cubed plus one by three pi times three squared times four, which simplifies to eighteen pi plus twelve pi, equaling thirty pi. Taking pi as twenty two by seven gives thirty times twenty two by seven, resulting in ninety four point two nine cubic centimeters.