In a right triangle, one angle measures exactly 90 degrees. In Triangle ABC, if we assume angle C is the right angle, this means that the sum of angles A and B must equal 90 degrees as well. This is derived from the fundamental property of triangles that states that the sum of all interior angles in any triangle is 180 degrees.
Since we know that Angle A + Angle B + Angle C = 180° and Angle C = 90°, we can simplify this to Angle A + Angle B = 90°. This relationship is known as the complementary angles relationship.
Therefore, in triangle ABC, since it is a right triangle, angles A and B are complementary, which means their measures add up to 90 degrees.