How to Circumscribe a Circle About a Triangle

Step	Example	Description
1		Start with triangle ΔABC.
2		Draw a perpendicular bisector of one of the sides. In this case, the perpendicular bisector of AB is drawn.
3		Draw a perpendicular bisector of another side. In this case, the perpendicular bisector of BC is drawn.
4		Label the intersection of the perpendicular bisectors as point D.
5		Draw a circle with center D and radius DA.
Table 1: Circumscribing a circle about a triangle.

Cite this article as:

McAdams, David E. How to Circumscribe a Circle About a Triangle. 4/22/2019. All Math Words Encyclopedia. Life is a Story Problem LLC. http://www.allmathwords.org/en/h/htcircumscribetriangle.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

4/22/2019: Update equations and expressions to new format. (McAdams, David E.)
3/17/2019: Removed broken manipulative. (McAdams, David E.)
7/16/2018: Removed broken links, updated license, implemented new markup, implemented new Geogebra protocol. (McAdams, David E.)
7/3/2008: Initial version. (McAdams, David E.)