Answer:
See proof below.
Explanation:
Statements Reasons
1. Line AB is parallel to line CD 1. Given
2. <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.