Given: ∠with AB ∥ CD. Prove: triangle ABC ∼ triangle CDE. Statement Reason 1. Given 2. ∠If two parallel lines are cut by a transversal, the corresponding angles are congruent. 3. ∆ AA criterion for similarity 4. Corresponding sides of similar triangles are proportional. 5. AB = AD Segment addition 6. Substitution property of equality 7. Division 8. Subtraction property of equality What is the missing statement in the proof?