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The following was removed: "Although the definition of the measurement of an angle does not support the concept of a negative angle," as unhelpful. Of course a definition can be contrived. Essentially one refers to area of a circular sector, using [[signed area]] according to the area being above or below the horizontal line of symmetry. This definition is for angles fixed in a standard position. Reference to [[area]] for definition is the historic basis of hyperbolic angle, so angle reference to area is one of the [[unifying theories in mathematics]]. [[User:Rgdboer|Rgdboer]] ([[User talk:Rgdboer|talk]]) 23:03, 9 November 2023 (UTC)
:This article needs to be clarified and expanded to more clearly describe and discuss the several different concepts of "angle" which are in common use. This is something I plan to do eventually; I've been occasionally gathering sources at [[User:Jacobolus/Angle]] but am not yet ready to write a solid survey. –[[user:jacobolus|jacobolus]] [[User_talk:jacobolus|(t)]] 00:45, 10 November 2023 (UTC)
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