This program will graph polar equations of the form r = r(t), where t is the angle, as well as parametric equations of the form x = x(t), y = y(t). Up to two equations can be plotted, and then you can "twiddle" any parameters a, b, c, contained in the functions r(t), x(t), y(t). Sample equations are provided.

Look at other programs in the University of Arizona collection.