find the volume of the ice cream cone G cut from the solid sphere rho < or = 1 by the cone phi = pi/3.

Please teach me how to find the limits of the variable for this question especially for rho.

Thank you very much.

Note: I think theta should be from 0 to 2pi.

phi should be from 0 to pi/3.

rho should be from 0 to 1. ( Intuitively, i think rho is from 0 , if I am right, I would like to have your opinion why rho is from 0.)