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6-54.

If in the diagram below, what must be true?

  1.  

  2.  

  3.  

  4.  

  5. none of these

Two lines A, C and D, F are cut by a transversal G, H. Point B is the intersection of A, C and G, H. Point E is the intersection of G, H and D, F.

What needs to be true in order for angles to be congruent?

D