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Herbert,

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?

Robert
----- 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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