What is the area of a triangle with side lengths 13, 14, and 15?
I'm pretty sure its 84
Use Heron's formula p = (13 + 14 + 15)/2 = 21
area = sqrt ( p (p-13)(p-14)(p-15) )
= sqrt (21 (8)(7)(6) ) = 84 units2 as Penguin stated !
+37153 
