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∠, the angle seembol in Unicode is U+2220

In geometry, an angle is the figure furmed bi twa rays, cried the sides o the angle, sharin a common endpoint, cried the vertex o the angle.[1] Angles are uisually presumed tae be in a Euclidean plane or in the Euclidean space, but are an aa defined in non-Euclidean geometries. In pairticular, in spherical geometry, the spherical angles are defined, uisin arcs o great circles insteid o rays.

ReferencesEedit

  1. Sidorov, L.A. (2001) [1994], "Angle", in Hazewinkel, Michiel, Encyclopedia of Mathematics, Springer Science+Business Media B.V. / Kluwer Academic Publishers, ISBN 978-1-55608-010-4