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Topic: Perpendicular Lines
Replies: 3   Last Post: Jan 2, 2013 11:09 PM

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Alain Schremmer

Posts: 861
Registered: 10/10/05
Re: Perpendicular Lines
Posted: Jan 2, 2013 9:10 PM
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On Jan 2, 2013, at 5:47 PM, Fred Siegeltuch wrote:

> Hi all,
>
> I've seen tons of examples of math modeling where parallel lines
> arise and have a natural interpretation but I could use help in
> finding ones where the product of the slopes equals -1 is useful in
> modeling other than in doing bare geometry problems algebraically.
> I'd appreciate an example where this fact was used in such a way
> that covering this material didn't seem tangential (please forgive
> the pun) to a modeling perspective for algebra. I could try to
> embellish a problem that tries to find the tangent line to a circle
> or circular cylinder with a specific given radius but as of now I'm
> trying to do better. Ideally this should be no higher than the
> intermediate algebra level.


Gradient lines are perpendicular to level lines.

Regards
--schremmer

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