LaTeXov risarski dodatek TikZ zna preko svoje knjižnice intersections presečišča krivulj tudi izračunati. Tako na primer koda

\usetikzlibrary{intersections}
*** QuickLaTeX cannot compile formula:
\begin{tikzpicture}[every node/.style={opacity=1, black, above left}]
\draw [name path=ellipse1] (2,0.5) ellipse (5cm and 1cm);
\draw [name path=ellipse2, rotate=40] (2,0.5) ellipse (5 and 1);
\fill [red, opacity=0.9, name intersections={of=ellipse1 and ellipse2}]
%(intersection-1) circle (2pt) node {1}
(intersection-2) circle (2pt) node {2}
%(intersection-3) circle (2pt) n
ode {3}
(intersection-4) circle (2pt) node [below]{4};
\draw [blue](intersection-2)--(intersection-4);
\end{tikzpicture}

*** Error message:
Environment tikzpicture undefined.
leading text: \begin{tikzpicture}

ustvari naslednjo risbico   Preostali presečišči zagledaš, če odkomentiraš vrstici v kodi.