The volume of a sphere is given by the following equation:
[tex]V=\frac{4}{3}\pi\cdot r^3^{}[/tex]Where r is the radius that is equal to half the diameter. If the diameter is 6.6mm then the radius is:
[tex]\frac{6.6\operatorname{mm}}{2}=3.3\operatorname{mm}[/tex]Then the volume of the sphere is given by:
[tex]V=\frac{4}{3}\pi\cdot(3.3\operatorname{mm})^3=150.53mm^3[/tex]So the volume of the sphere is 150.53 cube milimeters.
