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Thanks Herbert,

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.

Thanks,

Robert

----- Original Message -----
From: "Herbert Prinz" 
To: 
Sent: Thursday, March 30, 2006 12:10 AM
Subject: Re: Mathematics Question


> Robert Eno wrote:
>
>> Given that a segment of a circle is called an "arc", can anyone tell
>> me what its two-dimensional equivalent on a sphere is called?
>
> Solid angle. The unit is steradian (or square-degree, if you must. You
> get extra credit for saying it in German without stumbling:
> "Quadratgrad").
>
> If you google these phrases you will find more details.
>
> Herbert

   

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