In the proof below, provide the missing reasons.
Given: 

Prove: 

PROOF  
Statements  Reasons  
1.

1. ?  
(1)  2.

2. ? 
3.

3. ?  
(3)  4. Where

4. ? 
(2)  5.

5. ? 
(5)  6.

6. ? 
(4)  7.

7. ? 
(7)  8.

8. ? 
(7), (8)  9.

9. ? 
(6), (9)  10.

10. ? 
(10)  11.

11. ? 
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