Google is your friend! First hit using "formula chord height" in the search window! see http://www.1728.org/circsect.htm
Charles Weston --- On Sat, 7/7/12, Darrell <[email protected]> wrote: From: Darrell <[email protected]> Subject: {S-Scale List} Re: Basic Geometry To: [email protected] Date: Saturday, July 7, 2012, 1:02 PM 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 > > >
