|   | 1 |  initial version  | 
This parameter is documented in plot?? Your "best" option is probably polar_plot([2,2+2*cos(a)], (a, pi/2, 3*pi/2), fill={0:[1]})
 Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.
 
                
                Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.