Polar Coordinates

Graphs in polar coordinates are given by an equation r=f(θ) as theta ranges over an interval. This is equivalent to the parametric curve x=f(θ)*cos(θ),y=f(θ)*sin(θ) as θ ranges over the same interval. You may create such curves using the command 'draw', with the optional argument 'coordinates==polar'. Here are some examples:

You may also define your own functions, when you plan on plotting the same curve as θ varies over several intervals.

For information on plotting graphs in other coordinate systems see the pages for the CoordinateSystems domain.