The number of sides that the regular convex polygon has is; 18 sides
How to find the number of sides of a Polygon?
We know that the sum of the exterior angles of a regular convex Polygon is 360°.
The formula for the number of sides of a regular convex Polygon is;
n = 360/θ
where;
θ is the measure of the exterior angle.
Thus;
Number of sides = 360/20
Number of sides = 18
The complete question is;
A regular convex polygon has an exterior angle measure of 20° . How many sides does the polygon have?
Read more about Polygon sides at; https://brainly.com/question/1592456
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