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==Etymology==
==Etymology==
Middle French or Late Latin; Middle French, from Late Latin verticalis, from [[Latin]] vertic-, vertex
Middle French or Late Latin; Middle French, from Late Latin verticalis, from [[Latin]] vertic-, vertex
*Date: [http://www.wikipedia.org/wiki/16th_Centur 1559]
*Date: [https://www.wikipedia.org/wiki/16th_Centur 1559]
==Definitions==
==Definitions==
*1 a : situated at the highest point : directly overhead or in the [[zenith]]
*1 a : situated at the highest point : directly overhead or in the [[zenith]]
:b : of, relating to, or comprising [[persons]] of [[different]] [[status]] <the vertical arrangement of [[society]]>
:b : of, relating to, or comprising [[persons]] of [[different]] [[status]] <the vertical arrangement of [[society]]>
==Description==
==Description==
In [[geometry]], a pair of [[angles]] is said to be '''vertical''' (also [[opposite]] and vertically opposite, which is abbreviated as vert. opp. ∠s) if the [[angles]] are formed from two intersecting lines and the angles are not [[adjacent]]. They all share a [[vertex]]. Such angles are [[equal]] in [[measure]] and can be described as [http://en.wikipedia.org/wiki/Congruence_(geometry) congruent].
In [[geometry]], a pair of [[angles]] is said to be '''vertical''' (also [[opposite]] and vertically opposite, which is abbreviated as vert. opp. ∠s) if the [[angles]] are formed from two intersecting lines and the angles are not [[adjacent]]. They all share a [[vertex]]. Such angles are [[equal]] in [[measure]] and can be described as [https://en.wikipedia.org/wiki/Congruence_(geometry) congruent].
==Vertical angle theorem==
==Vertical angle theorem==
When two straight [http://en.wikipedia.org/wiki/Line_(mathematics) lines] intersect at a point, four [[angles]] are [[formed]] . The nonadjacent angles are called vertical or [[opposite]] or vertically opposite angles. Also, each pair of adjacent angles form a straight line and are [[supplementary]]. Since any pair of vertical angles are supplementary to either of the adjacent angles, the vertical angles are [[equal]] in [[measure]].[http://en.wikipedia.org/wiki/Vertical_%28angles%29]
When two straight [https://en.wikipedia.org/wiki/Line_(mathematics) lines] intersect at a point, four [[angles]] are [[formed]] . The nonadjacent angles are called vertical or [[opposite]] or vertically opposite angles. Also, each pair of adjacent angles form a straight line and are [[supplementary]]. Since any pair of vertical angles are supplementary to either of the adjacent angles, the vertical angles are [[equal]] in [[measure]].[https://en.wikipedia.org/wiki/Vertical_%28angles%29]
[[Category: Mathematics]]
[[Category: Mathematics]]
