Answer
20
Work Step by Step
We know that the sum of the exterior angles is 360 degrees.
Thus, the measure of each exterior angle is equal to $360/n$.
We use this to have:
$Angle=360/18=20$
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 6 - Polygons and Quadrilaterals - 6-1 The Polygon Angle-Sum Theorems - Practice and Problem-Solving Exercises - Page 356: 20
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