# Intersection point between line and arc

I am using tikzpicture for a long time now and making intersections between lines nicely. Even if I make an intersection between an circle and line works nicely and I also find some threads about that topic online. However, I did not manage to make the intersection between an arc and line. I checked this here (How to Intersect an arc with a line without calculating the angle) but they always work with circles and not arcs. The intersection I try to make is as follows:

\usepackage[utf8]{inputenc}
\usepackage{tikz}
\usetikzlibrary{intersections, calc}
\begin{document}
\begin{figure}[h]
\begin{tikzpicture}

% Points
\coordinate (a) at (0,0);
\coordinate (b) at (0,4);
\coordinate (c) at (0,6);
\coordinate (d) at (4,0);
\coordinate (e) at (6,0);

% Point for analyse line
\coordinate (f) at (7,7);

% Lines
\draw [-] (b) -- node [rotate=90, above] {Symmetry plane} (c);
\draw [-] (d) -- node [below] {Symmetry plane} (e);

% Arcs
\draw [-, name=R1] (d) arc [radius=4, start angle=0, end angle=90];
\draw [-] (e) arc [radius=6, start angle=0, end angle=90];

\path[name=L1] (a) -- (f);

% Intersection point (NOT WORKING)
\path[name intersections={of=L1 and R1, by=B}];

\end{tikzpicture}
\end{figure}
\end{document}

The problem I have here is, that the intersection can not be calculated. Maybe it is not working with arcs but I guess it should work. Using a full circle as a path is working but then the figure is getting bigger based on the circle (hope you get the point). Any idea suggestion is welcomed.

• Sorry for opening that question. I don't know why I was missing the correct syntax. Thanks Heiko for the fast answer. – Tobi Jun 24 '17 at 20:44

The option is called name path instead of name for naming a path to use it for the intersection:

\draw [-, name path=R1]
\path[name path=L1]
• Oh my good. What a stupid question I asked. In my other examples I have always [name path=FOO]. Thank you very much. – Tobi Jun 24 '17 at 20:43