20 New Principles of Gardening. 
Practice. Draw 2x equal to p, and ereft the Perpendi- 
cular xy equal to g, with the Intervals g and p, onzand y de- 
{cribe Arches eroffing in # ; join zy and #2, and the Para Helo- 
gram will be completed. 9, Z. F. 
PROBLEM XVIL 
O defcribe a Rhombus on a given Line xy. 
Fig. xt, Derintrron. A Ruomsus isa Geometrical Figure of four 
equal Sides, but the Angles are unequal, two oppofite ones be- 
ing Acute, and the other two Obtufe: ’Tis called Rhombus, from 
the Greek Word Rbumbos, a Fifh, called the Turbot, or Glafs 
Quarrels ina Window. 
Practice. On, with the Interval xy, defcribe the Arch 
x zm, make x 2% and 2 equal to ~4, and join 2, 2m, and 
ay, the Rhombus required. Q. E. F. 
rao Ss £ eM XVAT. 
O defiribe a Rhomboides, equal to the given Lines an 
and Angle m. 
DertniT10n. A Ruomsorpss is of the fame Derivationas 
the Rhombus, and is a Figure between a Pavrallelogram and a. 
R ; from the one it takes irs Correfpondency of Sides, 
from the other Proportion of Angles, and therefore is called a 
Fig. 
xX LiL. 
Rhomboides. 
Practice. Draw bf equal to 2, and (by Pros. IV. Sect I. 
the Angle df equal to m, making fd equal to a; on b = 
d, with the Intervals av, deferibe Arches croffing in ¢, join 
edand cb, the Rhomboides required. 0. E. F. 
PROBLEM XIx. 
“YT (0 aeferibe a Trapexia, equal to the given Lines abcd 
ana Angle e. 
Derr. 
