# Perimeter

Pronunciation: /pəˈrɪm.ɪ.tər/ Explain
 Click on the blue points and drag them to change the figure. Manipulative 1 - Perimeter of a Polygon Created with GeoGebra.

The perimeter of a polygon, is the edges, or boundary of the polygon, or the length of those edges. The perimeter of a simple closed curve is the boundary of that curve or the length of the boundary. The perimeter of a circle is called a circumference.

Click on the blue points in manipulative 1 and drag them to change the figure. The perimeter is the red lines of the polygon. Manipulative 2 shows the perimeter of an ellipse.

 Click on the blue points and drag them to change the figure. Manipulative 2 - Perimeter of an Ellipse Created with GeoGebra.

### References

1. McAdams, David E.. All Math Words Dictionary, perimeter. 2nd Classroom edition 20150108-4799968. pg 137. Life is a Story Problem LLC. January 8, 2015. Buy the book

• Triangle (perimeter). allmathwords.org. All Math Words Encyclopedia. Life is a Story Problem LLC. 3/12/2009. http://www.allmathwords.org/en/t/triangle.html.

McAdams, David E. Perimeter. 3/26/2019. All Math Words Encyclopedia. Life is a Story Problem LLC. http://www.allmathwords.org/en/p/perimeter.html.

### Revision History

3/26/2019: Corrected descriptions of the manipulatives. (McAdams, David E.)
12/21/2018: Reviewed and corrected IPA pronunication. (McAdams, David E.)