Each pair of exterior and interior angles sum to 180 degrees.The sum of all exterior angles of a polygon is 360 degrees.
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Exterior angle+interior angle=180 degrees and 180-exterior angle=interior angle
It is: 180-interior angle = exterior angle
180 minus interior angle = exterior angle
180 minus interior angle = exterior angle
180-interior angle = exterior angle If it's a regular polygon then: 360/number of sides = exterior angle