In Exercise 3 and 4, supply statements.
Given: 


Prove: 


PROOF  
Statements  Reasons  
1. ?  1. Given  
2. ?  2. Substitution  
3. ?  3. Angles with equal measures are congruent.  
4. ?  4. If a ray divides an angle into two congruent angles, then the ray bisects the angle. 
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