second

-module(second).

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

hypotenuse(A,B) ->
    %The square on the hypotenuse is equal to the sum of the square on the other two sides
    %To get the hypotenuse we take the square root
    math:sqrt(first:square(A)+first:square(B)).


perimeter(A,B) ->
    %perimeter is the sum of all side. We know sort sides A, B
    %we can calculate the other side as it is the hypotenuse
    A+B+hypotenuse(A,B).

area(A,B) ->
    %area is half of height times width (It is half a rectangle!)
    A*B/2.