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Parallel lines

In the diagram the lines AB and CD are crossed by the transversal EF. Click and drag any of the blue points so that AB is parallel to CD.

  1. Write down the names of one pair of alternate angles, one pair of cointerior angles and one pair of corresponding angles on the lines AB and CD.
  2. With reference to the terms 'alternate angles', 'cointerior angles' and 'corresponding angles', list three different conditions that exist when AB and CD are parallel.