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

Prove: 

(HINT: See Exercise 27 for help.)
To find:
The complete formal proof of the given theorem.
Given:
The statement of given theorem is,
If two angles are supplementary 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 supplementary angles is 
3. 
3. Substitution 
4. 
4 
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