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in mathematics, figure formed by the intersection of two straight lines; the lines are called the sides of the angle and their point of intersection the vertex of the angle. Angles are commonly measured in degrees (°) or in radians. If one side and the vertex of an angle are fixed and the other side is rotated about the vertex, it sweeps out a complete circle of 360° or 2π radians with each complete rotation. Half a rotation from 0° or 0 radians results in a straight angle, equal to 180° or π radians; the sides of a straight angle form a straight line. A quarter rotation (half of a straight angle) results in a right angle, equal to 90° or π/2 radians; the sides of a right angle are perpendicular to one another. An angle less than a right angle is acute, and an angle greater than a right angle is obtuse. Two angles that add up to a right angle are complementary. Two angles that add up to a straight angle are supplementary. One of the geometric problems of antiquitygeometric problems of antiquity,
three famous problems involving elementary geometric constructions with straight edge and compass, conjectured by the ancient Greeks to be impossible but not proved to be so until modern times.
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 is the trisection of an angle. Angles can also be formed by higher–dimensional figures, as by a line and a plane, or by two intersecting planes.
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Angle (Angular)

(religion, spiritualism, and occult)

The term “angle” can be used in two different ways in astrology. In its primary, traditional meaning, angle refers to one of the four “corners” (figuratively speaking) of a chart—namely, the cusps of the first, fourth, seventh, and tenth houses. Planets making a conjunction with the angles—which are sometimes called angular planets, particularly when they are in an angular house—are said to exercise an especially strong influence over the entire horoscope. In practice, astrologers pay the most attention to angular planets in the first and tenth houses. Angle is also used as an alternative term for aspect, as when one talks about the angular relationship between two planets.

The Astrology Book, Second Edition © 2003 Visible Ink Press®. All rights reserved.


The geometric figure, arithmetic quantity, or algebraic signed quantity determined by two rays emanating from a common point or by two planes emanating from a common line.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


1. The figure made by two lines that meet.
2. The difference in direction of such intersecting lines, or the space within them.
3. A projecting or sharp corner.
4. A secluded area resembling a corner; a nook.
5. An L-shaped metal member; an angle iron.
7. A fitting on a gutter for rainwater which changes the gutter’s direction.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.


1. the space between two straight lines that diverge from a common point or between two planes that extend from a common line
2. the shape formed by two such lines or planes
3. the extent to which one such line or plane diverges from another, measured in degrees or radians
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
The mean difference of 4.1[degrees] for both methods, which includes all thoracic and lumbar curves, was compatible with the intrinsic error of the Cobb method in an inter- and intra-observer analysis (24), in which the variability of Cobb angle measurements was between 4[degrees] and 8[degrees] (25,26).
An orthopedic surgeon (S) specialized in scoliosis with 25 years of experience manually measured the Cobb angle in 105 testing radiographs.
Intra- and Inter-Observer Reliability Cobb Angle Correlation Statistics Pearson r Correlation Coefficient Intra-observer Round 1 & 0.79 Reliability Round 2 Inter-observer ICC (3,1) Inter-observer Round 1 0.79 (95% CI: 0.62-0.93) Reliability Round 2 0.70 (95% CI: 0.50-0.89) Table 3.
This was preferred over the traditional linear stiffness measure so that the resultant stiffness was more easily relatable to the clinical Cobb angle measurement.
Cobb angles decreased from a mean of 74[degrees] to 36[degrees] immediately following growing rod implantation.
Karlamangla, "The reliability and validity of three non-radiological measures of thoracic kyphosis and their relations to the standing radiological Cobb angle," Osteoporosis International, vol.
The Cobb angle also is useful as a monitoring tool to measure progression or correction of the curve during bracing or observation.
The researchers found that, compared with never-users of HT, continuous users had a mean Cobb angle that was 4.0 degrees less, in minimally-adjusted models (P = 0.01); in fully-adjusted models, the correlation was attenuated to 2.8 degrees (P = 0.06).
Adult scoliosis is defined as a coronal deformity with a Cobb angle >10[degrees] in a skeletally mature patient.
[16] According to the Guidelines of the International Scientific Society on Scoliosis Orthopedic and Rehabilitation Treatment, a 5[degrees] error in the measurements of Cobb angle should be taken into account; therefore, those with a Cobb angle of [greater than or equal to]5[degrees] were included in this study.
From patients of PE who underwent the Nuss procedure at the Military General Hospital of Beijing PLA from February 2009 to March 2014, a total of 37 patients (22 males and 15 females) with an asymmetry of the thorax and a mild to moderate deformity of the spine (with a Cobb angle [less than or equal to]30[degrees]) were selected, and we excluded patients having platy thorax and barrel chest.