To classify this triangle, we need to look at it's angles, and know the definition of each of the triangles. We know that the triangle will have to be either right, obtuse, or acute. An obtuse triangle has one angle that is greater than or equal to 120°, a right triangle has an angle that is equal to 90°, and an acute triangle has all three angles less than 90°. Since this triangle has all its angles less than 90°, it is an acute triangle, or B.
