In Exercises 17 to 24, complete each proof.
Given:
Prove:
Exercises 19, 20
PROOF  
Statements  Reasons 
1. ?  1. Given 
2.

2. ? 
3. ?  3. ? 
To complete:
The proof by using given information.
Given:
Given:
Prove:
PROOF  
Statements  Reasons 
1. ?  1. Given 
2. 
2. ? 
3. ?  3. ? 
Definition:
AA:
If two angles of one triangle are congruent to two angles of another triangle, then the triangles are similar.
Description:
Given that
To Prove:
If two angles are vertical angles, then they are congruent. That is,
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