36o
For all polygons, the sum of the exterior angles is 360o.
For a regular polygon they are all the same thus:
exterior_angle = 360o ÷ number_of_sides
So for a decagon with 10 sides this becomes:
exterior_angle = 360o ÷ 10
= 36o
It is 36 degrees
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Providing that it's a regular decagon then each exterior angle will measure 36 degrees
360/10 = 36 degrees
For any polygon, regular or otherwise, the sum of exterior angles is always 3600.
Each exterior angle measures 36 degrees and the 10 exterior angles add up to 360 degrees.
216.