If the polygon has n sides, each exterior angle is 360/n degrees.
The interior angle is its supplement, that is 180 - exterior angle.
This is much simpler than trying to remember 180*(n-2)/n degrees.
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No regular polygon can have an interior angle of 180 degrees or more. No regular polygon can have an interior angle of 180 degrees or more. No regular polygon can have an interior angle of 180 degrees or more. No regular polygon can have an interior angle of 180 degrees or more.
Providing that it is a regular polygon then each interior angle will measure 160 degrees
4320
Providing that it is a regular 38 sided polygon then each interior angle will measure: 170o31'34.74''
51º per interior angle