A 2D shape with forty sides is known as a tentracontagon.
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The names of polygons with 40 sides - Tetracontagon.
A 41-sided shape is called a tetracontakaihenagon in mathematics. The naming convention for polygons uses Greek numerical prefixes, with "tetraconta" representing 40 and "henagon" representing a 1-sided polygon (which is a circle). Therefore, a 41-sided polygon is a tetracontakaihenagon.
360/9 = 40 degrees
The name of a 40 sided polygon is Tetracontagon.
The sum of the interior angles of a convex polygon with n sides is given by (n-2)x180o. So for a 40 sided polygon n=40; thus (40-2)x180o = 38x180o = 6840o.