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The reasons statements and reasons below are scrambled. It is your task to cut them out, unscramble them, and paste them in the correct sequence to prove the well-known fact that the sum of the three interior angles of a triangle is 180 . Triangle Angle-Sum Theorem (the sum of angles in a triangle is 180 ) Given: m || AC , AB is a transversal of m & AC w, y, z form a linear pair Prove: mx my mz 180 mx my mz 180 Angle Addition Theorem Given Reason mw my mz 180 Alternate Interior Angle Theorem Statement w & x and v & z are alternate interior angles formed by parallel lines mw mx and mv mz w, y, z form a linear pair Definition of alternate interior angles formed by parallel lines Substitution