Pronunciation: /ˈɛn vəˌloʊp/ Explain
Figure 1: Creation of an envelope.
In mathematics, an envelope is a curve that is tangent
to a family of lines or other geometric shapes. Figure 1 shows the creation of an
envelope from a family of lines. Manipulative shows two blue lines that are envelopes
for a family of circles. Click on the blue points in manipulative 1 and drag them to
change the figure.
Click on the blue points and drag them to change the figure.|
What would the circles look like if the two blue envelope lines were concurrent?
|Manipulative 1 - Envelope of Circles Created with GeoGebra.|
Cite this article as:
McAdams, David E. Envelope. 7/9/2018. All Math Words Encyclopedia. Life is a Story Problem LLC. http://www.allmathwords.org/en/e/envelope.html.
7/5/2018: Removed broken links, updated license, implemented new markup, implemented new Geogebra protocol. (McAdams, David E.)
1/24/2010: Added "References". (McAdams, David E.)
11/18/2008: Changed manipulative to GeoGebra. (McAdams, David E.)
5/10/2008: Initial version. (McAdams, David E.)