Hyperboloids of 2 Sheets Whose Axis is the z-axis

This is the equation of a hyperboloid of 2 sheets whose axis is the z-axis

> hyper2sz:=-x^2/a^2-y^2/b^2+z^2/c^2=1;

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

> hyper2sz1:=subs({a=1,b=2,c=3},hyper2sz);

>

Plot of the hyperboloid "hyper2sz1"