Question 873517
the diameter of a tennis ball is 19.5/3=6.5 cm the radius is 3.25
volume of  a cylinder is h*pi*r^2
volume of a sphere is pi*r^3
so we have 
a=19.5*pi*3.25^2-3(pi*(3.25)^3)
a = 323.535
c=647.07,   b=323.535
Apparently the three balls take up half of the cylinder.