Question

What are the five congruence postulates and theorems we have learned to prove that two triangles are congruent? Which of these reasons proves that triangle ABC is congruent to triangle CDA? How did you arrive at your answer? Be sure to answer in complete sentences.

Answer 1

Angle side Angle
parallel lines cut by a transversal form alternate interior angles 
parallel lines are congruent 
opposite angles are congruent ( angle D and angle B) 
line AB is congruent to line BC 

Answer 2

The correct answer is ASA