[PW] circumference question

[Nancy Jo Leachman]

This is for me.  I bought an item at a yard sale. When  all parts are attached to the wall, it will make a wreath.  There are 17 "arcs" quilted out of various red gingham materials. The arcs would lie flat against a wall. Picture something shaped like a crescent moon turned on its side. The outer curve has a scalloped edge. The inner curve is 25.5" long along the curve, and 23" in a straight line going from point to point of the crescent. I have 2 questions:
 
1. Is my logic correct that (17 * 25.5) divided by pi is the diameter of the inner circle? That would be approx. 11.5 feet wide.
2. Is there a way I can tell if the 17 pieces will indeed form a circle? That is, since I got it at a yard sale, how can I tell if all the pieces are there?
I have a large blank wall I'd love to decorate with the wreath, but I do not have 11+ feet of floor space (sans heavy pieces of furniture) to lay it out on.
 
Any help would be greatly appreciated.
 
Nancy Jo Leachman
Head of Reference
Salina Public Library
301 W. Elm
Salina, KS 67401
 
785 825-4624