Answer :

the diameter is given so the diameter is 4.5216

if you wanted the volume then the equation is 4/3(pi)(r^3)

diameter=2r
r=4.5216/2=2.2608
4/3(3.141529)(2.2608^3)
4/3(3.141529)(11.5554)
(4.18879)(11.5554)
48.4033 cubic units