Lines Angles and Triangles


   
 
Theorem 2
Statement
 
If a transversal intersects two parallel lines, then each pair of alternate angles are equal.
 
 
Given:
 
AB||CD and EFGH is a transversal.
 
To prove:
 
 
 
Proof:
 
(Vertically opposite angles)
 
 
 
 
From (i) and (ii),
 
 
 
 
  
     
   
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