The interior angle of a polygon is the angle formed by two adjacent sides of a polygon where the angle lies inside the area formed by the polygon. The exterior angle is that formed by one of these sides and the line formed by extending the other side. Consequently, External angle = 180 deg - Internal angle. Because they form supplementary angles, it does not matter which of the two sides you extend.
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It is: 180-interior angle = exterior angle
180 - interior angle = exterior angle
the interior angle is about 128.571428 the exterior angle is about 51.4285
Exterior angle = 360/number of sides = 360/15 = 24 degrees.Interior angle = 180 - Exterior angle = 180 - 24 = 156 degrees.Angle at centre = Exterior angle = 24 degrees.Exterior angle = 360/number of sides = 360/15 = 24 degrees.Interior angle = 180 - Exterior angle = 180 - 24 = 156 degrees.Angle at centre = Exterior angle = 24 degrees.Exterior angle = 360/number of sides = 360/15 = 24 degrees.Interior angle = 180 - Exterior angle = 180 - 24 = 156 degrees.Angle at centre = Exterior angle = 24 degrees.Exterior angle = 360/number of sides = 360/15 = 24 degrees.Interior angle = 180 - Exterior angle = 180 - 24 = 156 degrees.Angle at centre = Exterior angle = 24 degrees.
An exterior angle of a polygon is the supplement of the corresponding interior angle. The exterior angle is the angle between an extended sides of the polygon and the next side of the polygon.