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    Re: Mathematics Question
    From: Robert Eno
    Date: 2006 Mar 30, 11:14 -0500

    Yes, I should have phrased my question in another way. But I was refering to 
    the curved surface of the sphere. For a circle, it is called an "arc" but I 
    have yet to find a proper name for a portion of the surface of a sphere. I 
    have heard different terms such as "lune", "lens" "cap" etc. but I am certain 
    that there has to be a proper mathematical term for this. Or is there?
    ----- Original Message -----
    From: Herbert Prinz 
    Date: Thursday, March 30, 2006 2:38 am
    Subject: Re: Mathematics Question
    > Robert Eno wrote:
    > > Just to make sure I got this right, please have a look at the
    > diagram> on the
    > > following website:
    > >
    > > http://whatis.techtarget.com/definition/0,,sid9_gci528813,00.html
    > >
    > > Is the lens-shaped figure in red called a steradian or does this
    > term> refer
    > > only to the cone shaped figure in the centre of the sphere?  I
    > am looking
    > > for the name of the red lined shape.
    > >
    > >
    > Robert,
    > It appears that I misunderstood your question. You said "arc" and I
    > thought "angle". What you really wanted was the name for the curved
    > surface of a spherical cap (i.e. the surface without the flat bottom),
    > right? I am not sure whether there is a name for that, at least I
    > am not
    > aware of  any.
    > Herbert

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