A regular 18-gon, also known as an octadecagon, has 18 sides. Each side is of equal length, and each internal angle measures 150 degrees. This polygon is part of the family of polygons that can be defined with any number of sides.
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There are 18 sides
The measure of one exterior angle of a regular 18-gon is 20°. The sum of all exterior angles of a regular polygon is always 360° so the measure of each exterior angle can be calculated by dividing 360° by the number of sides. In this case that would be: 360° 18 = 20°Therefore the measure of one exterior angle of a regular 18-gon is 20°.
It has 18 sides and interior angles,which of them are 160 degrees each and 2880 degrees total and is also called an octadecagon or octakaidecagon.
360/18 = 20 sides
If you say this shape is 18 sided i would guess it has 18 sides. ;)