How to deuide the arche of a circle into two equall partes,
without measuring the arche.
Deuide the corde of that line info ij. equall portions, and then
from the middle prycke erecte a plumbe line, and it shal parte
that arche in the middle.
[Illustration]
_Example._
The arch to be diuided ys A.D.C, the corde is A.B.C, this corde
is diuided in the middle with B, from which prick if I erect a
plum line as B.D, then will it diuide the arch in the middle,
that is to say, in D.