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Degree (angle)
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Standard:  NonSI accepted unit 
Quantity:  Angle 
Symbol:  °^{[1]}^{[2]} 
Expressed in:  1 °^{[1]}^{[2]} = 
turns  1360 turn 
radians  π180 rad 
gons  109^{g} 
It is not an SI unit. The SI uses radian to measure plane angle. However, according to the SI brochure, it is an accepted unit by SI.^{[6]}
History
The actual reason of choosing the degree as a way to measure plane angle is unknown. One theory says that it is related with the fact that a year is approximately 360 days.^{[4]} Some ancient calendars, for example the Persian calendar and the Babylonian calendar, used 360 days for a year.
Another theory says that the Babylonians divided the circle using the angle of an equilateral triangle. The angle was then divided into 60 parts. This is because they used sexagesimal or base60 numeral system.^{[7]}^{[8]}
Related pages
References
 ↑ HP 48G Series – User's Guide (UG) (8 ed.). HewlettPackard. December 1994. HP 0004890126, (0004890104). http://www.hpcalc.org/details.php?id=3937. Retrieved 20150906.
 ↑ HP 50g graphing calculator user's guide (UG) (1 ed.). HewlettPackard. 20060401. HP F2229AA90006. http://www.hpcalc.org/details.php?id=6512. Retrieved 20151010.
 ↑ "Compendium of Mathematical Symbols" (in enUS). 20200301. https://mathvault.ca/hub/highermath/mathsymbols/.
 ↑ ^{4.0} ^{4.1} Weisstein, Eric W.. "Degree" (in en). https://mathworld.wolfram.com/Degree.html.
 ↑ "Degrees (Angles)". https://www.mathsisfun.com/geometry/degrees.html.
 ↑ Bureau International des Poid et Mesures (2006). The International System of Units (SI) (8 ed.). Archived from the original on 20091001. https://web.archive.org/web/20091001100650/http://www.bipm.org/en/si/si_brochure/chapter4/table6.html.
 ↑ Jeans, James Hopwood (1947). The Growth of Physical Science. pp. 7. https://books.google.com/books?hl=en&lr=&id=JX49AAAAIAAJ&oi=fnd&pg=PA7.
 ↑ Murnaghan, Francis Dominic (1946). Analytic Geometry. pp. 2.
