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 Related Terms
Interior Angle:  An interior angle of a polygon is formed by two adjacent sides. Also, when a third line (a transversal) crosses two other lines, the angles formed in between the other two lines are called interior angles. (see alternate interior angles)
 Angle: Region between two rays or the amount of rotation about a fixed point. Adjacent Sides: Two sides of a polygon that share a common vertex. Alternate Interior Angles: Alternate interior angles are pairs of angles formed when a third line (a transversal) crosses two other lines. These angles are on opposite sides of the transversal and are in between the other two lines. Transversal: A line that crosses two or more lines. Exterior Angle: An exterior angle of a polygon is formed when you extend a side of a polygon. Also, when a third line (a transversal) crosses two other lines, the angles formed outside the other two lines are called exterior angles. (see alternate exterior angles)