-module(second).
-export([hypotenuse/2, perimeter/2, area/2]).

hypotenuse(X,Y) ->
    A = first:square(X),
    B = first:square(Y),
    math:sqrt(A + B).

perimeter(X,Y) ->
    H = second:hypotenuse(X, Y),
    X + Y + H.

area(X, Y) ->
    (X * Y) / 2.