[VAC] Re: Grade %

[Bob Basques]

Maybe this will muddy it up some more, a 100% grade would be a 45deg angle. (1:1 slope) same "run" to "rise".

A 50% grade would be (1:0.5 slope [or should I say 2:1?]) twice the "run" to "rise".

I made a picture for those interested ( OK, so I'm bored)

http://64.33.167.222/examples/grade-slope.jpg

bobb
 
 

Doug Rowbottom wrote:

--- "Dr. Gerald N. Johnson, electrical engineer"
<[EMAIL PROTECTED]> wrote:
> The mathematical relationship is that tangent(
> angle) = rise/run.
> Surveyors measure rise with a level and rod, and run
> with a tape. So %
> grade is simply 100 * rise / run. Far simpler to
> compute than angle. And
> at low slopes, under 5 or 6%, slope and angle are
> essentially the same
> for the angle in radians. There 360 degrees in a
> circle and 2 pi (=
> 6.28) radians. At 1 degree slope, slope (not %) is
> 0.017455. The angle
> in radians is 0.017453. There are (360/ 2 pi)
> 57.29578 degrees per
> radian. End of math lesson.
>
> Gerald J.
>
Whaaaat the h*** are you talking about
Doug

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