(Type "t" for .)

__Example__:*f* (*r*,)=*r*

** Click** the "Graph" button
(this button also refreshes the graph).

** Rotate** the graph by
clicking and dragging the mouse on the graph.

** To erase** the graph and all input fields, click the
"Clear" button.

__Plane__:*f*(*r*,)=*r* cos

__Hemisphere__:*f*(*r*,)=(25-*r*^{2})

__Paraboloid__:*f*(*r*,)=*r*^{2}-5