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 Description  
 Opposite Angles:  Two nonadjacent angles formed by intersecting lines or segments. Also called vertical angles.


In the above example, angles EKG and HKF are opposite angles because their sides are formed by two intersecting segments (EF & GH). Notice that the angles have only one point in common, the vertex (K). How many pairs of opposite angles are in this diagram? What is the relationship between the measurements of opposite angles?