Angle of rotation is [tex]20^{0}[/tex].
An angle of rotation is the measure of the amount that a figure is rotated about a fixed point called a point of rotation.
According to the question
18-sided, regular polygon is rotated about its center.
Angle of rotation will the image of the polygon coincide with the preimage:
Angle = [tex]360 \div 18[/tex]
= [tex]20^{0}[/tex]
Angle of rotation is [tex]20^{0}[/tex].
Find out more information about angle of rotation here
https://brainly.com/question/17671314
#SPJ2
