Warp wrote:
> John VanSickle <evi### [at] hotmailcom> wrote:
>> A manhole is *circular* minimize the amount of extra material needed to 
>> make it impossible for the cover to fall into the manhole.
> 
>   Are you sure it's a question of minimizing material and not simply because
> it's the *simplest* possible solution for the problem (ie. avoid the cover
> to ever fall into the manhole)?

It is the simplest solution, but if another solution used less material, 
economics would drive one of those solutions.

Regards,
John

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