Lines Angles and Triangles


   
 
Theorem 4
Statement
 
If a side of a triangle is produced, the exterior angle so formed is equal to the sum of the interior opposite angles.
 
 
Given:
 

 
To prove:
 
 
Proof:
 
…(i) ( Theorem)
 
 
From (i) and (ii),
 
 
 
 
  
     
   
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