# Circular Paraboloid of Revolution

- Author:
- Tim Brzezinski

Recall the locus definition of a

**parabola**(illustrated here if you need a refresher). Well, imagine spinning this parabola 360 degrees about its axis (of symmetry). Doing so yields a 3D solid called a**circular paraboloid of revolution.**Interact with this applet for a few minutes.*Be sure to slide the***Slide Me!**slider completely once**messing around with the other sliders!***before***Note: Point P is a point that lies on this solid. Move it wherever you'd like.**After doing so, answer the question that follows.A circular paraboloid of revolution is a locus (set of points that satisfy a condition or set of conditions). How would you describe this locus?