Angle

Not to be confused with Angel.

In geometry, an angle is formed by two lines that meet at a point.[1] Each line is called a side of the angle, and the point they share is called the vertex of the angle.[2][3] The term angle is used to denote both geometric figures and their size or magnitude. Angular measure or measure of angle are sometimes used to distinguish between the measurement and figure itself. The measurement of angles is intrinsically linked with circles and rotation, and this is often visualized or defined using the arc of a circle centered at the vertex and lying between the sides.

  1. ^ Heath, Thomas Little; Heiberg, J. L. (Johan Ludvig) (1908), The thirteen books of Euclid's Elements, Cambridge, The University Press, p. 176, A plane angle is the inclination to one another of two lines in a plane which meet one another and do not lie in a straight line.
  2. ^ Hilbert, David, The Foundations of Geometry (PDF), p. 9
  3. ^ Sidorov 2001
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