Answer:See proof below.Step-by-step explanation:Statements Reasons1. Line AB is parallel to line CD 1. Given2. <A is congruent to <ECD 2. If parallel lines are cut by a transversal, then corresponding angles are congruent.3. <B is congruent to <EDC 3. If parallel lines are cut by a transversal, then corresponding angles are congruent.4. Tri. AEB is congr. to tri. CED 4. If two angles of a triangle are congruent to to angles of another triangle, then the triangles are similar.