1 The diagram below shows the construction of AB ( through point P parallel to CD. P B C Which theorem justifies this method of construction? 1) If two lines in a plane are perpendicular to a transversal at different points, then the lines are parallel. 2) If two lines in a plane are cut by a transversal to form congruent corresponding angles, then the lines are parallel. 3) If two lines in a plane are cut by a transversal to form congruent alternate interior angles, then the lines are parallel. 4) If two lines in a plane are cut by a transversal to form congruent alternate exterior angles, then the lines are parallel.

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