Question 364112
a^2 + 15^2 = (a - 13)^2 + 24^2


a^2 + 225 = a^2 - 26a + 169 + 576 ___ 26a = 520 ___ a = 20


the two sides of the triangle are 15 and 20 
___(looks like a 3-4-5 triangle) so the hypotenuse (ladder) is ?