a)
function res = pytagoras ( a, b ) res = sqrt ( a^2 + b^2 ); end
function length = polygonCircum(x, y) length = 0; n = size(x, 2); if n > 0 && size(x, 2) == size(y, 2) for i = 1:n -1 a = x(i) - x(i+1) ; b = y(i) - y(i+1) ; length = length + pytagoras(a, b); end a = x(n) - x(1) ; b = y(n) - y(1) ; length = length + pytagoras(a, b); end end