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20 Degrees N.
A polygon with an interior angle sum of 2880 degrees has 20 sides. This can be calculated using the formula for the sum of interior angles, which is ( (n - 2) \times 180 ) degrees, where ( n ) is the number of sides. Setting the equation ( (n - 2) \times 180 = 2880 ) and solving for ( n ) gives ( n = 20 ). Therefore, the polygon is a 20-sided figure, known as an icosagon.
40 degrees
18 because if exterior = 20 degrees, then the interior must equal 160 degrees... using the formula: (n-2)x180=160n... (n-2)180=160n 180n-360=160n 180n-160n-360 20n=360 n=18
The formula that I use is (n-2)180 where n=number of sides. Plug in 20 and you get (20-2)180 (18)180 3240 degrees