Pronunciation: /ˌkoʊˈtɜr.mə.nl/ Explain
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Manipulative 1 - Coterminal Angles Created with GeoGebra.

Two angles are coterminal if they have a common terminating line segment (terminus). Coterminal angles may make a full circle, or involve rotating the terminus through at least one full circle.

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What can you say about two line segments that are coterminal at both endpoints?
Manipulative 2 - Coterminal Line Segments Created with GeoGebra.

Two line segments are coterminal if the have a common end point.


  1. McAdams, David E.. All Math Words Dictionary, coterminal. 2nd Classroom edition 20150108-4799968. pg 49. Life is a Story Problem LLC. January 8, 2015. Buy the book

Cite this article as:

McAdams, David E. Coterminal. 12/21/2018. All Math Words Encyclopedia. Life is a Story Problem LLC.

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Revision History

12/21/2018: Reviewed and corrected IPA pronunication. (McAdams, David E.)
6/25/2018: Removed broken links, updated license, implemented new markup, updated GeoGebra apps. (McAdams, David E.)
5/5/2011: Initial version. (McAdams, David E.)

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