The polar coordinates and can be converted to the Cartesian coordinates and using the trigonometry functions:
It follows that a figure specified in can be plotted by ‘plot2d’ as a parametric curve:
Fig. 1
It is possible to plot two or more parametric curves together:
Fig. 2 and
An alternate is the ‘draw2d’ function, it draws graphic objects created by the ‘polar’ function:
Fig. 3 and
Fig. 4 shows a graceful geometric curve that resembles a butterfly. Its equation is expressed in polar coordinates by
Fig. 4