Pronunciation: /saɪn/ ?

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Manipulative 1: Sine. Created with GeoGebra.

Sine is defined to be equal to the length of the side opposite the angle divided by the length of the hypotenuse.[1] In manipulative 1, click on the blue points and drag them to change the figure.

sine=opposite/hypotenuse; sine=1/cosecant
Figure 1: Sine Equations.


  1. Fine, Henry B., Ph. D.. Number-System of Algebra Treated Theoretically and Historically, 2nd edition, pp 28-29,47-48. D. C. Heath & Co., Boston, U.S.A., 1907. (Accessed: 2009-12-19).
  2. Hutton, Charles. A Course in Mathematics, Volume II, 4th edition, pg 2. G. & J. Robinson, 1804. (Accessed: 2010-01-21).
  3. sine. WordNet. Princeton University. (Accessed: 2011-01-08).

More Information

  • McAdams, David. Cosecant. All Math Words Encyclopedia. Life is a Story Problem LLC. 2009-03-12.

Cite this article as:

Sine. 2009-12-19. All Math Words Encyclopedia. Life is a Story Problem LLC.


Image Credits

Revision History

2009-12-19: Added "References" (McAdams, David.)
2008-10-30: Changed manipulative to GeoGebra (McAdams, David.)
2008-04-30: Initial version (McAdams, David.)

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