take away the interior angle adjacent to it from 360
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The sum of a regular polygons exterior angles always = 360
For any n-sided regular polygon the exterior angles are 360/n degrees.
Measure them with a protractor
Use a protractor and you'll find that the 3 interior angles add up to 180 degrees and that the 3 exterior angles add up to 360 degrees
They are all 60 degrees.