Lines Angles and Triangles


   
 
Theorem 1
Statement
 
If two lines intersect, then the vertically opposite angles are congruent.
 
 
 
Data:
 
 
To prove:
 
 
Proof:
 
 
 
 
 
 
 
 
Similarly it can be proved that
 
 
Hence the theorem is proved.
 
  
     
   
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