Find the number of sides in a regular polygon if it's each interior angle is 160 degree
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If the interior angle of a regular polygon is 160 degrees, then the exterior angle is 20 degrees.
The sum of all exterior angles is 360 degrees so there must be 360/20 sides = 18 sides.
The sum of all exterior angles is 360 degrees so there must be 360/20 sides = 18 sides.
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