Inactive Tutor answered • 04/03/22
Tutor
New to Wyzant
The exterior angles of all polygons add to 360°.
2 Answers By Expert Tutors
The sum of the degree measures of the exterior angles of a polygon is 360.
So, 77 + 40 + 45 + 3x = 360
3x = 198
x = 66
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