Perimeter Of A Irregular Polygon By Points

function Perimeter_Of_A_Irregular_Polygon_By_Points(points, i=1) =

let(   
     Side = (norm(points[i]-points[i-1])))
    i<len(points)?Side 

+Perimeter_Of_A_Irregular_Polygon_By_Points(points, i+1) 

:(norm(points[0]-points[i-1]));