Alternate Exterior Angles Help

The term alternate exterior angles is often used when two lines are cut by a third line, a transversal.

In the figure above, line tt is a transversal cutting lines kk and ll , and there are two pairs of alternate exterior angles:

1∠1 and 7∠7

4∠4 and 6∠6

The Alternate Exterior Angles Theorem states that if kk and ll are parallel, then the pairs of alternate exterior angles are congruent. That is,

17∠1≅∠7 and 46∠4≅∠6.

The converse of this theorem is also true, and math helper online could do it for you.

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