OK, David, that's a different situation from my previous reply. That formula simply won't work here.
After a little research I found out that there is no direct way to make the calculation. However, using Newton's method you can close in on an approximation. It does get into more sophisticated math than can be done on a basic calculator. A scientific calculator (one with trig functions) could probably do it. Darrell --- In [email protected], "David Engle" <rirocket@...> wrote: > > I'm using "arc" as the segment of the circle, and "chord" as the straight > line between the same two end points of the arc. DJE > > ----- Original Message ----- > From: Darrell > To: [email protected] > Sent: Saturday, July 07, 2012 1:02 PM > Subject: {S-Scale List} Re: Basic Geometry > > > > 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 > > > > > > ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/S-Scale/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/S-Scale/join (Yahoo! ID required) <*> To change settings via email: [email protected] [email protected] <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
