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RonaldB · Answer 1 · 2019-06-09T22:28:44+0000

A regular nonagon is 9-sided polygon with all congruent sides and congruent interior angles.

The sum of exterior angles of n-sided polygon is 360°. If all interior angles of regular nonagon are congruent, then all exterior angles are congruent too.

Then each exterior angle has the measure of

$(360^(\circ))/(9)=40^(\circ).$

Answer:
$40^(\circ)$

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