When two parallel lines are cut by a transversal, four interior angles are formed on the inside of the parallel lines and four exterior angles are formed on the outside of the parallel lines. The angles inside a polygon are called interior angles of the polygon.

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Answer:When two parallel lines are cut by a transversal, four interior angles are formed on the inside of the parallel lines and four exterior angles are formed on the outside of the parallel lines. The angles inside a polygon are called interior angles of the polygon.