Definitions for vertical angles
In geometry, a pair of angles is said to be vertical if the angles are formed from two intersecting lines and the angles are not adjacent. The two angles share a vertex. Such angles are equal in measure and can be described as "equal" or "congruent".
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"vertical angles." Definitions.net. STANDS4 LLC, 2013. Web. 4 Dec. 2013. <http://www.definitions.net/definition/vertical angles>.