Answer:
1. Given
2. Definition of midpoint
3. Substitution
4. ASA
5. CPCTE
Step-by-step explanation:
1. ∠1 = ∠2, ∠3 = ∠4, D is midpoint of segment BE, BC = DE is given (given).
2. BD = DE, because D is midpoint of BE (definition of midpoint).
3. BC = BD, because you are given that BC = DE and DE = BD, then substitute instead of DE into the first equation segment BD to get BC = BD (substitution).
4. ΔABD≅ΔEBC, because
then by ASA theorem ΔABD≅ΔEBC (ASA theorem).
4. Congruent triangles have congruent corresponding parts, then ∠A≅∠E (CPCTE).