A twenty-sided polygon is called an "icosagon" If it is a regular icosagon - all its sides and angles are equal - then it's interior angles are all 162 degrees. You can verify this by drawing a line to the centre from each angle.. There will be 20 small angles arranged in a circle around the centre. These must total 360 degrees. As 360 / 20 = 18, this leaves the other angles of each triangle to add up to 162, because the interior angles of a triangle total 180 degrees.
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Providing that it is a regular 38 sided polygon then each interior angle will measure: 170o31'34.74''
Providing that it is a regular polygon then each interior angle will measure 160 degrees
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An interior angle of a 30-sided polygon can have any value between 0 and 360 degrees : with the possible exception of 180 degrees - which would make it a 29 sided polygon!
51º per interior angle