The point P with polar coordinates (r,q) is such that OP=r and the angle between the x-axis and the line through OP is q measured counter clockwise. Equivalently if P has Cartesian coordinates (x,y) then x=rcosq and y=rsinq.

The question asks for an explanation of the features of the graph. If you want to use a software package to sketch the graph you may want to download the shareware graphing software Graphmatica .