Reflex Angle

Pronunciation: /ˈri.flɛks ˈæŋ.gəl/ Explain

Click on the blue point and drag it to change the figure. Can you find all 5 angle classes represented? Manipulative 1 - Angle Classes Created with GeoGebra.

Angles are divided into four classes according to their measure. A reflex angle is an angle that measures more than 1/2 of a full circle and less than afull circle. Classes of Angles Degree Measure Radian Measure Class Name α < 90° α < π/2 rad. Acute angle α = 90° α = π/2 rad. Right angle 90° < α < 180° π / 2 < α < π rad. Obtuse angle α = 180° α = π rad. Straight angle 180 < α < 360° π < α < 2π rad. Reflex angle α = 360° α = 2π rad. Full angle Table 1: Classes of angles

References

1. McAdams, David E.. All Math Words Dictionary, reflex angle. 2nd Classroom edition 20150108-4799968. pg 153. Life is a Story Problem LLC. January 8, 2015. Buy the book
2. reflex angle. merriam-webster.com. Encyclopedia Britannica. Merriam-Webster. Last Accessed 12/4/2018. http://www.merriam-webster.com/dictionary/reflex angle. Buy the book

Cite this article as:

McAdams, David E. Reflex Angle. 5/2/2019. All Math Words Encyclopedia. Life is a Story Problem LLC. https://www.allmathwords.org/en/r/reflexangle.html.

Image Credits

• All images and manipulatives are by David McAdams unless otherwise stated. All images by David McAdams are Copyright © Life is a Story Problem LLC and are licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

Revision History

5/2/2019: Changed equations and expressions to new format. (McAdams, David E.)
12/21/2018: Reviewed and corrected IPA pronunication. (McAdams, David E.)
12/4/2018: 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.)
12/14/2009: Expanded table of angle classes. (McAdams, David E.)
9/16/2008: Initial version. (McAdams, David E.)