New Principles of Gardening. 
GH, HL, LM, and MD, will compleat the Odfagon re- 
quired. Q, BF. 
PROBLEM XXIV. 
O deftribe a Nonagon, or Enneagon, whofe Sides {hall 
’ be each equal to a given Line, (D L.) 
DEFINITION. ENNEAGON, from the Greek, a Regular Po- 
lygon, or Geometrical Figure, confifting of nine equal Sides, 
and the like Angles. 
Practice. Bifett DL in C, and thereon raife the Per- 
pendicular CH; on L, with the Interval LD, defcribe the 
Arch DB, which divide into fix equal Parts, as in the pre- 
ceding; make BA equal to three Parts of the Arch BD; on 
A, with the Interval AL, defcribe the Circle L, D, E, F, G, 
H, I, K, and therein fet off the Diftance DL, from D to E, 
from EtoF, ©. 9, EF. 
N. B. That the fecond Problem hereof may be ufed 
when ’tis required, to infcribe a regular Po/ygon within a 
Circle, Se. : ann | 
N. B. That Regular Polygons of any Kind may be infcribed 
by the following Rule, vzz. 
Divide the Circumference of the Circle three hundred and 
fixty Degrees, by the Number of Sides in the Polygon, and 
the Quotient will be the Number of Degrees contain’d in each 
Side: As for Example, 
Let the Polygon be a Decagon, which is a Geometrical 
Figure of ten equal Sides, and the like Angles. : 
PRACTICE 
#3 
Fig. 
XLIX. 
