The interior angles of polygons follow certain patterns based on the number of sides, too. First of all, a polygon with n sides has n vertices, and therefore has n interior angles. The sum of these interior angles is equal to 180(n-2) degrees. Knowing this, given all the interior angle measures but one, you can always figure out the measure of the unknown angle.
A special rule exists for regular polygons: because they are equiangular, the exterior angles are also congruent, so the measure of any given exterior angle is 360/n degrees. As a result, the interior angles of a regular polygon are all equal to 180 degrees minus the measure of the exterior angle(s).
crdts to :https://www.sparknotes.com/math/geometry1/polygons/section3/
Answers & Comments
ANSWER
180°
Interior Angles
crdts to : https://www.sparknotes.com/math/geometry1/polygons/section3/
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Answer:
B. 180º
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