If you’re correct I’ll give u brainlist!!

Answer:
5. Addition property of length
Step-by-step explanation:
it is the same thing as in step 4.
1. Given
2. Given
3. Given
4. Addition property of length
5. Addition property of length
6. Addition property of length
7. Substitution Property of Equality
8. SSS congruence postulate
9. CPCTC