Drexel dragonThe Math ForumDonate to the Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.

Math Forum » Discussions » Math Topics » geometry.college.independent

Topic: -- Lune and lens: correct definitions?
Replies: 9   Last Post: Mar 26, 2008 4:10 AM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
David W. Cantrell

Posts: 827
Registered: 7/2/06
Re: -- Lune and lens: correct definitions? - Also in Wikipedia
Posted: Jan 25, 2008 4:24 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

JEMebius <jemebius@xs4all.nl> wrote:

> >> "David W.Cantrell" <DWCantrell@sigmaxi.net> writes:
> >>

> >>> The notion of a crescent or lune was discussed recently in
> >>> alt.math.recreational. Interested readers might look at my second
> >>> posting (Nov. 12) in the thread "crescent shapes"

> Also take a look at http://en.wikipedia.org/wiki/Lune_%28mathematics%29

Thanks for the suggestion.

In my article in alt.math.recreational, to which I had provided a link, I
had already given links to the Wikipedia entries for both lune and lens.

Their entry for lune says "In plane geometry, a lune is a concave area
bounded by two arcs, necessarily of unequal radii." But I must suspect that
that last condition originated with MathWorld. As such, I do not think it
supports any necessity that the radii be unequal, but rather merely shows
how "contagious" errors can be.


Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2015. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.