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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There are 4 interior angles in a quadrilateral
It has 18 interior angles.
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