Cones

This is the equation of a cone whose axis is the z-axis

> conez:=x^2/a^2+y^2/b^2=z^2/c^2;

Let's check it out for a=1, b=2, c=3

> conez1:=subs({a=1,b=2,c=3},conez);

>

Plot of the cone "conez1"