The number of sides of a regular polygon:
where each exterior angles has a measure of 18°
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Measure of each exterior angle =360°/n; where, n = number of sides of a polygon. One important property about exterior angles of a regular polygon is that, the sum of the measures of the exterior angles of a polygon is always 360°
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The total angel is 360°
Therefore each exterior angle is 360°/ 18°
so, the value of angle is 20°
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