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Created page with 'File:lighterstill.jpgright|frame ==Etymology== Middle French or Late Latin; Middle French, from Late Latin verticalis, from Latin vertic-, vertex ...'
[[File:lighterstill.jpg]][[File:Vertical2.jpg|right|frame]]

==Etymology==
Middle French or Late Latin; Middle French, from Late Latin verticalis, from [[Latin]] vertic-, vertex
*Date: [http://www.wikipedia.org/wiki/16th_Centur 1559]
==Definitions==
*1 a : situated at the highest point : directly overhead or in the [[zenith]]
:b of an aerial photograph : taken with the camera pointing straight down or nearly so
*2 a : [[perpendicular]] to the [[plane]] of the [[horizon]] or to a primary [[axis]] : upright
:b (1) : located at right [[angles]] to the [[plane]] of a [[supporting]] [[surface]] (2) : lying in the direction of an [[axis]] : lengthwise
*3 a : [[relating]] to, involving, or [[integrating]] [[economic]] [[activity]] from basic production to point of sale <a vertical [[monopoly]]>
:b : of, relating to, or comprising [[persons]] of [[different]] [[status]] <the vertical arrangement of [[society]]>
==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].
==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]

[[Category: Mathematics]]

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