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Given:

Prove:



What evidence in the proof supports the statement that ?

Statements Reasons
1. 1. given
2. 2. given
3. 3. vertical angle theorem
4. 4. definition of congruence
5. 5. linear pair theorem
6. 6. subtraction property of equality
7. 7. angle addition postulate
8. 8. substitution property of equality
9. 9. subtraction property of equality
5
8
7
6
3
4