--- "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.
>
And I thought it was just a steep hill.
Doug
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