This problem made Khayyam to succeed in solving the cubic equation x3 + 200x = 20x2 + 2000 and he found a positive root of this cubic by considering the intersection of a

rectangular hyperbola and a circle.

Rectangular Hyperbola Model of First Normal Stress Difference of PNCs.

Figure 7 illustrates the fitting of the experimental results of [N.sub.1] of PLA/NGP composites into the proposed rectangular hyperbola model (Eq.

Simply stated, Khayyam solved the cubic equation x3 + 200x = 20x2 + 2000 dilemma as he found its positive root by considering the intersection of a

rectangular hyperbola and a circle.

Among these models rectangular hyperbola model of Cousens [6] is used to describing the yield decrease that is affected from weeds density.

Rectangular hyperbola function fitted to TCL and wheat yield indicates the increase of weeds density based on TCL caused the decrease in yield (Figure 1).

Owing to properties of the virtual axis of an rectangular hyperbola on which peaks of all elements lie, it is enough to have one authentic point.

The method of rectangular hyperbolas assumes that their peaks (i.e.

Inverse (KNP = a + b/PGR) and

rectangular hyperbola {KNP = a(PGR - b)/[1 + c(PGR - b)]} equations were fitted (Jandel Tablecurve, 1992) to the data from Exp.

However, in these applied works, not only is the same iso-hiring curve assumed to exist for all sectors, but it is also assumed to be a

rectangular hyperbola.

In this case, if K is the atomic mass, the equation Y = K/X would represent a

rectangular hyperbola in the first quadrant (K > 0).

Both (1) and (2) represent

rectangular hyperbolas with centre