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OpenStudy (anonymous):
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OpenStudy (anonymous):
180- 540/5 or 360/5
Directrix (directrix):
That angle with measure x is an exterior angle. The sum of the exterior angles of a polygon is 360. There are 5 of them, one per vertex. Because the polygon is regular, the interior as well as exterior angles are congruent. 360/5 = 72 degrees for x. The adjacent and supplementary interior angle is 108 degrees. 72 degrees for x --> Answer
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