The angles between adjacent sides of a polygon that are interior to the polygon. If the polygon is convex, the interior angles are always less than 180 degrees. If it is concave, at least one interior angle will be greater than 180 degrees.
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It has 18 interior angles.
There are 4 interior angles in a quadrilateral
They are 4 alternate interior angles.
180x28 is the sum of the interior angles in a 30- gon
The interior angles add up to 3960 degrees