#You probably need the right-hand sem-iring: l1=[(3*cos(phi),3*sin(phi)) for phi in srange(-n(pi)/2,n(pi)/2,0.01)] l2=[(6*cos(phi),6*sin(phi)) for phi in srange(-n(pi)/2,n(pi)/2,0.01)] l2.reverse() figure4=polygon(l1+l2) figure4.show(xmin=-6,xmax=6)
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