Triangle ABC is shown with AC || BD.


B


D


The sum of the interior angles of a triangle equals 180°.


Move options to the blanks to complete the proof.


Reason


Statement


AC || BD


and 262


Given


25


m22 + m


+m


Alternate interior angles are congruent.


= 180°


Straight angles add to 180°.


= 180°


Substitution


m22 + m


רו


21


22


23


24


25


26