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Four walls
on 21 Oct 2021
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t=linspace(0,2*pi);
x=16*sin(t).^3;
y=13*cos(t)-5*cos(2*t)-2*cos(3*t)-cos(4*t) ;
figure('color','w')
patch(x,y,'r')
hold on
plot([-15 15],[-1 -1],'w','LineWidth',7)
plot([0 0],[-17 6.8],'w','LineWidth',7)
axis equal off