Two lines intersect to create two pairs of vertical angles. One pair consists of angles A and B; the second pair consists of angles C and D.
A pair of angles is said to be vertical (US English) or opposite (British English) if the angles share the same vertex and are bounded by the same pair of lines but are opposite to each other. Such angles are congruent and thus have equal measure.[1] If two line segments, EF and GH, intersect at the point P, they form four angles, EPG, GPF, FPH, and HPE. These angles can be grouped into two pairs of vertical angles: one vertical pair contains EPG and FPH, and the other pair contains GPF and HPE. Any angle in the first pair is supplementary to any angle in the second pair.[2] Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ... This article is about angles in geometry. ... In geometry, a vertex (plural vertices) is a special kind of point, usually a corner of a polygon, polyhedron, or higher dimensional polytope. ... “Line†redirects here. ... An example of congruence. ... This article is about angles in geometry. ... The geometric definition of a line segment In geometry, a line segment is a part of a line that is bounded by two end points, and contains every point on the line between its end points. ... In mathematics, the intersection of two sets A and B is the set that contains all elements of A that also belong to B (or equivalently, all elements of B that also belong to A), but no other elements. ... Look up supplementary in Wiktionary, the free dictionary. ...
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