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answered 2020-07-09 09:58:32 +0100
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]})
plot?
polar_plot([2,2+2*cos(a)], (a, pi/2, 3*pi/2), fill={0:[1]})