Replies

1. 
   JPGrout | Apr 22, 2003 04:45am | #1

   The one I use (and there are several that work the same) is

   width squared + 4x(height squared)

   divided by (8xheight)

   Joe

2. 
   lostarrow | Apr 22, 2003 05:01am | #2

   This is the formula that I always used to make arch forms :

    Where A= base of arc (chord) , B= height of arch ;

    goes like this >>>  A divided by 2 (squared )  +  B squared  / divided by 2B = R

   What this means is : Divide the base by 2 then square the answer,  square the height and add that to the base figure, then divide that sum by 2 times B = Radius