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Re: Perpendicular Lines
Posted:
Jan 2, 2013 9:10 PM


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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