To make a twileke triangle, whiche shall haue euery of the
ij. angles that lye about the ground line, double to the
other corner.
Fyrste make a circle, and deuide the circumference of it into
fyue equall partes. And thenne drawe frome one pricke (which you
will) two lines to ij. other prickes, that is to say to the iij.
and iiij. pricke, counting that for the first, wherhence you
drewe both those lines, Then drawe the thyrde lyne to make a
triangle with those other twoo, and you haue doone according to
the conclusion, and haue made a twelike triangle, whose ij.
corners about the grounde line, are eche of theym double to the
other corner.
_Example._
[Illustration]
A.B.C. is the circle, whiche I haue deuided into fiue equal
portions. And from one of the prickes (which is A,) I haue drawen
ij. lines, A.B. and B.C, whiche are drawen to the third and
iiij. prickes. Then draw I the third line C.B, which is the
grounde line, and maketh the triangle, that I would haue, for
the angle C. is double to the angle A, and so is the angle B.
also.