Has the concept of angle originated from circles ? I don't understand the concept of angles. I want to know how people start using the word "angle" in mathematics. When I want to know about angles, all I get to know is it's a meausre of movement of a line. But that does not satisfy me. Please explain this "angle'' phenomenon to me from its birth.


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put on hold as unclear what you're asking by Carl Witthoft, Alexandre Eremenko, Francois Ziegler, José Carlos Santos, Conifold Nov 8 at 18:51

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  • You may be better served reading an introductory Geometry textbook and then restating your question. – Carl Witthoft Nov 8 at 12:47
  • See Angle : "The word angle comes from the Latin word angulus, meaning "corner"; cognate words are the Greek ἀγκύλος (ankylοs), meaning "crooked, curved," and the English word "ankle". Both are connected with the Proto-Indo-European root *ank-, meaning "to bend" or "bow"". – Mauro ALLEGRANZA Nov 8 at 14:37
  • Euclid's definition:"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." It is observed that students do not learn what angles are from such definitions or even a picture (much in two lines and the meeting point is moot to the concept), but rather they learn it by learning to add angles. – Conifold Nov 8 at 18:55

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