Question 498732: the lenghts of the sides of a triangle are given. classify each triangle as acute, right or obtuse, 15,8,21 Answer by cleomenius(959) (Show Source):
You can put this solution on YOUR website! 8^2 + 15^2 = 21^2
64 + 225 < 441
When c^2 < a^2 + b^2 , angle C is acute.
When c^2 > a^2 + b^2 , angle C is obtuse.
The triangle is obtuse.
