90 degrees. Exterior angle of any regular n-sided polygon is 360/n degrees
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Each exterior angle of a square is 90 degrees and a square is a regular 4 sided quadrilateral
It is: 180-exterior angle = interior angle because there are 180 degrees on a straight line
Each exterior angle of a regular 6 sided hexagon measures 60 degrees
Each exterior angle of a regular octagon measures 45 degrees
Providing that it's a regular decagon then each exterior angle will measure 36 degrees