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From: sobriquet <dohduhdah@yahoo.com>
Newsgroups: sci.math
Subject: Re: The Circles
Date: Tue, 1 Jul 2025 13:29:59 +0200
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Op 01/07/2025 om 07:16 schreef Ross Finlayson:
> On 06/30/2025 11:29 AM, Chris M. Thomasson wrote:
>> On 6/28/2025 8:38 PM, Ross Finlayson wrote:
>>> Oh, been a while, figure I'll post.
>> [...]
>>
>> An ellipse is nothing more than a circle projected in 3d? ;^)
>>
> 
> That's frivolous.
> 
> An ellipse is constructible from a loop of string and two pegs.
> 
> An image of a circle onto a plane as projected from
> an incident angle via 3D:  is not an ellipse, either.
> 
> Ask your shadow.
> 
> 

Looks like an ellipse to me:

https://www.desmos.com/3d/syqqdp9cef?translucentSurfaces