Mary is explaining the angle relationship of the interior angles of triangles to a coworker. She states that the angles should always add up to 180°. How can Mary prove that this is true? (Hint: Imagine taking the angles and putting them side by side.)
Answer
Answer:
There are three angles in a triangle. Angles can be cut off and arranged as adjacent angles on a straight line. The sum of the measure of interior angles is always 180°.