l1=[(cos(phi),sin(phi)) for phi in srange(n(pi)/4,3*n(pi)/4,0.01)] l2=[(2*cos(phi),2*sin(phi)) for phi in srange(n(pi)/4,3*n(pi)/4,0.01)] l2.reverse() p=polygon(l1+l2) c1=circle((0,0), 1,rgbcolor=(0,0,0)) c2=circle((0,0), 2,rgbcolor=(0,0,0)) l0=line([(-2*cos(n(pi)/4),2*sin(n(pi)/4)),(0,0),(2*cos(n(pi)/4),2*sin(n(pi)/4))],color='black') (p+l0+c1+c2).show(xmin=-2,xmax=2,ymin=-2,ymax=2,axes_labels=['x','y'],fontsize =16)
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