In Exercises 27 to 35, complete the formal proof of each theorem.
If two angles are complementary to the same angle, then these angels are congruent.
Given: 

Prove: 

PROOF  
Statements  Reasons 
1.

1. ? 
2.

2. ? 
3.

3. ? 
4.

4. ? 
5.

5. ? 
To find:
The complete formal proof of the given theorem.
Given:
The statement of given theorem is,
If two angles are complementary to the same angle, then these angels are congruent.
Given:
Prove:
Definition:
If the sum of two angles is
Approach:
The formal proof of given theorem is explained in table below.
Statements  Reasons 
1. 
1. Given 
2. 
2. Sum of two complementary angles is 
3. 
3. Substitution 
4. 
4 
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