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Tony Maro · Answer 1 · 2019-05-31T12:21:52+0000

The sum of the measures of all exterior angle in a polygon with n sides is always
$360^(\circ)$ .

Nonagon is a polygon with 9 sides. If this nonagon is regular or equiangular, then all interior angle are congruent, and therefore all exterior angles are congruent. Then the measure of each exterior angle is
$(360^(\circ))/(9) =40^(\circ)$ .

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