Pronunciation: /ˈsoʊ.kə.toʊ.ə/ Explain
Abbreviation: SOHCAHTOA

SOHCAHTOA is an mnemonic or acronym used to remember the relationship of trigonometric function and the right triangle. The letters stand for:

Click on the blue points and drag them to change the figure.

Sine equals opposite/hypotenuse. Cosine equals adjacent/hypotenuse. Tangent equals opposite/adjacent.
Manipulative 1 - SOHCAHTOA Created with GeoGebra.


  1. McAdams, David E.. All Math Words Dictionary, SOHCAHTOA. 2nd Classroom edition 20150108-4799968. pg 167. Life is a Story Problem LLC. January 8, 2015. Buy the book

Cite this article as:

McAdams, David E. SOHCAHTOA. 5/7/2019. All Math Words Encyclopedia. Life is a Story Problem LLC.

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Revision History

5/7/2019: Changed equations and expressions to new format. (McAdams, David E.)
12/21/2018: Reviewed and corrected IPA pronunication. (McAdams, David E.)
12/7/2018: Removed broken links, updated license, implemented new markup, implemented new Geogebra app. (McAdams, David E.)
8/7/2018: Changed vocabulary links to WORDLINK format. (McAdams, David E.)
5/5/2011: Initial version. (McAdams, David E.)

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