% 
function Squares_Concentric(a0,b0,length0,delta,n)

a=a0;
b=b0;
length=length0;

for i=1:n    
  a=a0+(i-1)*delta;
  b=b0+(i-1)*delta;
  length=length0-2*(i-1)*delta;
  square(a,b,length);
end