The name of a 40 sided polygon is Tetracontagon.
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The interior angles of a 40 sided polygon add up to 6840 degrees
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.
It looks like a circle
Each central angle of a regular 9 sided polygon: 360/9 = 40 degrees
A five sided polygon is called a pentagon because pentagon means five sided polygon I think.