Editing Curve sketching (section)

==The analytical triangle==
[[Jean Paul de Gua de Malves|De Gua]] extended Newton's diagram to form a technique called the '''analytical triangle''' (or ''de Gua's triangle''). The points (α,&nbsp;β) are plotted as with Newton's diagram method but the  line α+β=''n'', where ''n'' is the degree of the curve, is added to form a triangle which contains the diagram. This method considers all lines which bound the smallest convex polygon which contains the plotted points (see [[convex hull]]).<ref>{{harvtxt|Frost|1918|loc= Chapter IX}}</ref>