It is named as the 'INTERIOR ANGLE'.
The size is dependent on the number of sides of the polygon.
However, use the equation
Ext. Ang = 360 / n
Where 'n' is the number of sides of the polygon.
Then
Int. Ang = 180 - Ext. Ang.
Combining the two equations.
Int. Angle = 180 - (360/n)
So as an example the five sided polygon (pentagon).
Int. Ang. = 180 - (360/5)
Int. Ang = 180 - 72
Int. Ang = 108 degrees.
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An internal angle of the polygon.
A angle formed inside a polygon by two adjacent sides.
A polygon is a closed plane figure bounded by straight sides. Since it is a closed surface, it has an interior (inside) and an exterior (outside). The interior angle of a polygon is the angle formed by two adjacent sides such that the angle is facing the interior of the polygon.
If measured on the inside of the polygon, the it is an interior angle.
In a non-convex (or concave) polygon, at least one interior angle is a reflex angle. An alternative definition is that if you take any two points inside a conves polygon, the line joining them is wholly inside the polygon.