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on 14 Oct 2022
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x = [-1 1 0 -1];
y = [-1/sqrt(3) -1/sqrt(3) 2*sqrt(3)/3 -1/sqrt(3)];
plot(x,y,'k','LineWidth',3)
t = 0:0.001:2*pi;
xc = cos(t)/3+x';
yc = sin(t)/3-y';
for i = 1:3
patch(xc(i,:),yc(i,:),'k')
end
patch(x,-y,'w','EdgeColor','w')
axis equal off
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