function l = obseg(A)
%l = obseg(A) vrne obseg l poligona, 
%ki je dan z zaporedjem tock 
%A = [A1, A2, ..., An].

%obseg poligona brez tock je 0
l = 0;
%sestejemo dolzine vseh stranic
for k = 1:(length(A)-1)
	l = l + norm(A(:, k+1) - A(:, k));
end
%pristejemo se dolzino AnA1
l = l + norm(A(:, 1) - A(:, k+1));