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(a + b)(b - 2c)
This is known as the Cosine Rule.
(a+b-c)2 = a2 + b2 +c2 +2ab - 2bc - 2ac
well finding the surface area of one face is just like finding the area of a flat rectangle, so all you have to do is find the area of each face and add them up into one sum. i believe that the formula is 2ab + 2bc + 2ac
a2 = b2 + c2 - 2bc cos(alpha) b2 = a2 + c2 - 2ac cos(beta) c2 = a2 + b2 - 2ab cos(gamma) There are all three formulas. Do not forget to use, arc-cos, when finding angles.