Alternate Exterior Lines at Exterior

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Alternate Exterior Lines. Find the value of x. Four exterior angels are formed totally when two lines are intersected by their transversal line.

PPT 3.2 Properties of Parallel Lines PowerPoint
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• on the outer side of those two lines. If two parallel lines are cut by a transversal, then the alternate interior angles are equal. The alternate exterior angles are the opposing pair of exterior angles formed by the transversal and the two lines.

PPT 3.2 Properties of Parallel Lines PowerPoint

If alternate exterior angles are congruent, then the lines are parallel. The alternate exterior angles theorem states that, when two parallel lines are cut by a transversal , the resulting alternate exterior angles are congruent. In the figure above, line t is a transversal cutting lines k and l , and there are two pairs of alternate exterior angles: Similar to before, angles 1 , 2 , 7 and 8 are exterior angles.