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How can you prove that the triangles at right are congruent? 

  1. none of these

The triangles share a side. The parallel lines give a pair of congruent angles.

A four sided polygon, shaped like a diamond, with a horizontal segment, connecting the left vertex, to the right vertex, labeled as follows: upper left, & lower right sides, each has 2 arrows, bottom angle, & top angle, each has 1 tick mark.