Angle

class=skin-invert-image|alt=two line bent at a point|thumb|upright=1.25|A green angle formed by two red Ray (geometry)|rays on the [[Cartesian coordinate system]]

relation in Euclidean geometry among the three sides of a right triangle

function of an angle

right|thumb|The azimuth is the angle formed between a reference direction (in this example north) and a sightline|line from the observer to a point of interest projected on the same plane as the reference direction orthogonal to the [[zenith.]]

thumb|upright=1.4|right|A simplified illustration of the parallax of an object against a distant background due to a perspective shift. When viewed from "Viewpoint A", the object appears to be in front of the blue square. When the viewpoint is changed to "Viewpoint B", the object appears to have moved in front of the red square. thumb|right|This animation is an example of parallax. As the viewpoint moves side to side, the objects in the distance appear to move more slowly than the objects close to the camera. In this case, the white cube in front appears to move faster than the green cube in t

In astronomy, declination (abbreviated dec; symbol δ) is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle. The declination angle is measured north (positive) or south (negative) of the celestial equator, along the hour circle passing through the point in question.

astronomical equivalent of longitude

90° angle (π/2 radians): an angle that bisects the angle formed by two halves of a straight line

physical quantity defined as the rate of change of angular position whose direction is (if regarded as a vector) the axis of rotation

property of all triangles on a Euclidean plane

property of all triangles on a Euclidean plane

angle on the horizontal plane between magnetic north and true north

measure of a subtended portion of a sphere, used to describe the apparent size of items in a three-dimensional field of view

thumb|Estimating the height of a mountain using triangulation

one of the orbital elements used to specify the orbit of an object in space

rate of change of the phase angle

angular measurement describing how large a sphere or circle appears from a given point of view

one of the orbital elements used to specify the orbit of an object in space

ability of any image-forming device to distinguish small details of an object

theorem

angle formed in the interior of a circle

angle of incidence for which all reflected light will be polarized

unit of angle

angle between two planes in space

three angles introduced by Leonhard Euler to describe the orientation of a rigid body with respect to a fixed coordinate system

measure of two radii meeting

tangent of the angle of a surface to the horizontal

mathematical function which preserves angles

navigation using radio signals

angular extent of a given scene that is imaged by a camera

degree of heel or leaning of vessel, typically a water-going

unit of angle

angle between a liquid–vapor interface and a solid surface

coordinate system

term in geometry

angular parameter of Keplerian orbits

measure for how wide an angle is

error of a magnetic compass caused by local magnetic fields

angle between a ray incident on a surface and the line perpendicular to the surface at the point of incidence

theorem

measurement relating to observed visual binary stars

division of 360° angle into two sub-angles, such that one is 1.618034 times bigger than the other (i.e. the golden ratio or ɸ)

displacement measured angle-wise when a body is showing circular or rotational motion

mathematical theorem, valid in absolute geometry, that the measure of an exterior angle of a triangle is greater than either of the measures of the remote interior angles

tool used to mark angles in woodworking

right|200px thumb|200px|Side views of a bevel (above) and a chamfer (below) A bevelled edge (UK) or beveled edge (US) is an edge of a structure that is not perpendicular to the faces of the piece. The words bevel and chamfer overlap in usage; in general usage, they are often interchanged, while in technical usage, they may be differentiated as shown in the image on the right. A bevel is typically used to soften the edge of a piece for the sake of safety, wear resistance, aesthetics; or to facilitate mating with another piece.

angle between incident and reflected light in astronomy

ratio of the circumference of a circle to its radius

angle in ballistics

trigonometric functions of an angle

electroweak coupling constant describing the position of the electromagnetic U(1) within the electroweak gauge group; the arccosine of the W-boson/Z-boson mass ratio

argument of the hyperbolic functions

in hyperbolic geometry, the angle at one vertex of a right hyperbolic triangle that has two hyperparallel sides

angle between the chord of the wing and the longitudinal axis of the fuselage

Angle an object subtends at the eye

concept in geometry

Celestial coordinate system

radio wave analysis method