In Exercises 27 to 35, complete the formal proof of each theorem.
If the exterior sides of two adjacent acute angles form perpendicular rays, then these angles are complementary.
Given: 

Prove: 

PROOF  
Statements  Reasons 
1.

1. ? 
2. ?  2. If two rays are

3.

3. ? 
4.

4. ? 
5.

5. Substitution 
6. ?  6. If the sum of the measures of two angles is

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