Q: How to draw a cone in Sage? Given a cone with equation
z^2 = x^2 + y^2,
how would I draw it in Sage?
I tried turning it into a function and passing arguments but it didn't work out for me.

A: I have drawn the cone with the following code: 
var('x,y,z')
implicit_plot3d(x^2+y^2-z^2==0, (x, -3, 3), (y, -3,3), (z, -3,3))

