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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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Q: What is the measure of one exterior angle of a regular decagon?
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