Quantum redactiones paginae "Angulus" differant

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[[Fasciculus:Radian.svg|thumb|Angulus unius radianis.]]
Mensura anguli est [[radian (unitas)|radian]] (rad) aut [[gradus anguli|gradus]] (°). Gradus est 1/360 pars circuli. Radian est pars circuli cuius circumferentia radium circulum aequat; est fere 57° (gradus). Angulus rectus est angulus 90° aut π/2 radianum; [[quadratum]] et [[rectangulum]] quattuor angulos rectos habent.
 
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* [[Protractor]]
 
== Notae ==
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== Bibliographia ==
* Chisholm, Hugh, ed. [[1911]]. "Angle." ''Encyclopaedia Britannica.'' Ed. 11a. Cantabrigiae: Cambridge University Press.
* Heiberg, Johan Ludvig. [[1908]]. ''Euclid: The thirteen books of Euclid's Elements, 1.'' Ed. T. L. Heath. http://books.google.com/books?id=UhgPAAAAIAAJ.
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