find the measure of an interior and exterior angle of a regular polygon of 9 sides
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The exterior angles of a polygon = 360°. In a regular polygon all interior angles are congruent. As a result, all exterior angles in a regular polygon are congruent. 360°/9 = 40°
To find the value of an internal angle within this polygon, we can just multiply the number of triangles by 180 ° , then divide by the number of internal angles, which is nine. Excellent! So the interior angle of a 9 -sided polygon is 140 ° .
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