but a poor approximation can occur.
A point may be left outside of the convex hull ('<a href="qh-optt.htm#Tv">Tv</a>').
Examples include
the furthest-site Delaunay triangulation of nearly cocircular points plus the origin, and the convex hull of a cone of nearly cocircular points. The width of the band is 10^-13.
<pre>
        rbox s 1000 W1e-13 P0 D2 t996799242 | qhull d Tv
        rbox 1000 s Z1 G1e-13 t1002152123 | qhull Tv
        rbox 1000 s Z1 G1e-13 t1002231668 | qhull Tv
</pre>

<p>
<li><b>Quadratic