What's this 3d figure called please?

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What's this 3d figure called please?

Postby kingmaz » Mon Jan 05, 2009 12:51 pm

Image

I'm talking about the blue bit only: ie. what's left from cylinder minus cone.
I thought it was an arrinder, but that's big cone minus smaller cone isn't it?

I did have cause to calculate its volume (or about a third of it at least) when measuring the earthworks of a roundabout.
The roundabout wasn't that steep, obviously!
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Re: What's this 3d figure called please?

Postby Keiji » Mon Jan 05, 2009 2:46 pm

I don't think there is a name for this shape.
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Re: What's this 3d figure called please?

Postby kingmaz » Tue Jan 06, 2009 9:39 am

Right, mazinder it is then! :D

*awaits argument*
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Re: What's this 3d figure called please?

Postby Keiji » Tue Jan 06, 2009 3:56 pm

Fine by me

*wasn't planning to use that name for anything*
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Re: What's this 3d figure called please?

Postby Max88831 » Tue Jan 06, 2009 8:54 pm

I would call it a nozzle
like a rocket nozzle, thats pretty simple :XP:
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Re: What's this 3d figure called please?

Postby kingmaz » Wed Jan 07, 2009 11:03 am

That is a sensible idea Max, I agree and it certainly implies a conic recess.
The only problem I have with that is that it refers to the green volume rather than the blue.
Or to put it another way, the nozzle could refer a conic recess in any base shape.

The shape is also like a right-angled triangular torus but with no hole (polar displacement operator).
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