Darrel, On a circular curve you would need to know som other parameters, such as the tangent length (T) in feet, the intersection of the straight lines projected from the ebginning and end points of the curve, and the angle created by the two tangents (I). Then you can use the formula:
T = R tan 1/2 I, or to find the radius: R = tan 1/2 I divided by T Bob Frascella Wenham, MA On Sat, Jul 7, 2012 at 2:02 PM, Darrell <[email protected]> wrote: > ** > > > OK, let me refine my explanation. I'm using "chord" for the straight line > segment from one point to another on the circle. I'm using "arc" for the > straight line from the center of the chord to the curve. Probably incorrect > terminology, and I hope those are the dimensions you have. > > Darrell > > > --- In [email protected], "Darrell" <darrell.ev.smith@...> wrote: > > > > If you have a computer (I assume you do or you wouldn't be HERE) you > have a calculator of sufficient capacity. You merely need to know the > formula. > > > > where c is the length of the chord and a is the length of the arc, > > > > radius = (a² + 1/4c²)/2a > > > > Plug in your values, do the math, and there you are..... > > > > so..... > > > > square a and add to memory. square c and multiply x .25 and add to > memory. recall memory and divide by two, then divide by a. you are done. > > > > Darrell > > > > --- In [email protected], "David Engle" <rirocket@> wrote: > > > > > > Can someone please recommend a cheap calculator or app that will do > the radius of a curve when the arc and chord lengths are measured. DJE > > > > > > > >
