Bill Potts wrote: >Terry Simpson wrote: >>No. A grad is not a grade. A grade is the rise in height >>divided by the road distance travelled expressed as a percentage. >>A 100% grade = 45 degrees. > >If a 100% grade is 45 degrees, then a grade must be the rise >(or fall) in height, divided by the horizontal distance traveled, >not the road distance traveled (which would be along the >hypotenuse of the implied triangle).
Oops. My definition in words was correct, but my conversion of a 100% grade into 45 degrees was incorrect. Sorry about that. The side opposite and the hypotenuse define the grade. A 20% hill might also be described as "one in five". I leave it to others to convert 100% to degrees and 45 degrees into a grade.
