The name of a 18 sided polygon is Octadecagon.
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An 18-sided polygon is called an octadecagon or an octakaidecagon.
A regular octdecagon (18 sided geometric figure) was internal angles of 160 degrees.
If its a regular 9 sided polygon then the exterior angles are 40 degrees.
The central angle of a n-sided regular polygon = 360 degrees / n. Hence, the central angle of a 15-sided regular polygon = 360 degrees / 15 = 24 degrees ============================
Each interior angle measures 160 degrees