To know what kind of triangle is it. use the pythagorean theorem: A^2 + B^2 = C^2, where C is the longest side of the triangle if it satisfies the equation then it is a right triangle if it does not then A^2 + B^2 > C^2 so it is acute triangle if A^2 + B^2 < C^2 it is obtuse triangle
18^2 + 13^2 ? 27^2 324 + 169 ? 729 493 < 729 so it is obtuse triangle
