Calculating an Arc
from Mark Gunter's old website

 Mathematics For Woodworkers Calculating an Arc Arc Math (Height, Width, and Radius) Enter the two measurements of the arc that you know. Press the title button of the remaining box to compute the third measurement. The Formula: The formula to compute arc measurements is: 2hr = h2 + (w/2)2 where h = height w = width r = radius Example To find the radius of an arc that is .75 inches high and 3.5 inches wide: enter .75 for height enter 3.5 for width press Radius button The answer (2.41667) is computed and displayed Hints If you only know one number you can play with the remaining numbers to work out two that fit. The box titles are submit buttons - don't look for a special "submit" or "compute" button. Simply fill in the known values, then press the button next to the box that represents the value to be computed. Credits Thanks to Joel P. Watson for this javascript calculator, Mary Ann Watson - Joel's LOML, proofreading Doug Watson - scripts, testing
 This site is maintained by: Good-Lyddon Data Systems Copyright © 2004-2007 Joe Lyddon, WoodWorkStuff.net