Why not use polar cylindrical ?
I have tried to calculate the volume of a cone with base radius "a" and height "h" using a triple integral. Either by hand or using a CAS calculator I get the same answer: a^2*h*pi. Can someone point out where is the error?
The height from the base to the surface of the cone is not , but rather should be . And I agree - using polar coordintes would make the integral much simpler to evaluae.