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 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)

Sum of Angles in a Polygon: Explore the relationship between the number of sides of a polygon and the sum of its interior angles.

Interior angles: Explore the sum of interior angles of a quadrilateral.

Remotely Interior: Compare exterior angles with remote interior angles.