Исходники иллюстрации

\documentclass[tikz]{standalone}\input{pre.tex}\begin{document}\begin{tikzpicture}
    \draw[magenta, fill=magenta!10] (0,0) circle (2cm);
    \draw[magenta, fill=magenta!0] (-1,0) circle (1cm);

    \draw (0,0) node[blue]{$\times$};
    \draw (-1,0) node[blue]{$\times$};
    \draw (1/6,0) node[magenta]{$\times$};

    \begin{scope}[yshift=0cm, xshift=0cm]
        \lineann[3cm]{0}{2}{$R$};
    \end{scope} 

    \draw[axis] (-3,0) -- (3,0) node [right] {$+x$};

    % \draw[magenta, fill=magenta!1] (0,0) circle (2cm);

    % \draw[magenta, fill=magenta!10] (-1,1.5) -- ++(0, 0.1) -- ++ (2,0)  coordinate (I) -- ++ (0,-0.1)  coordinate (II) -- cycle;

    % \draw[axis] (-3,-1) -- ++(0,5);
    % \draw[axis,->] (0,-1) -- ++(0,5) node[above] {$+x$};

    % \hlLabel{-3}{0}{$0$};
    % \hlLabel{-3}{3}{$h$};

    % \draw[blue,<-] (2,1.6) -- ++ (0,0.3);
    % \draw[blue,<-] (2,1.5) -- ++ (0,-0.3);
    % \draw[blue] ($(2,1.5)!0.5!(2,1.6)$) node[right, xshift=0.5em] {$dx$};

    % \draw[axis] (I) -- ++(1,0);
    % \draw[axis] (II) -- ++(1,0);
    % \begin{scope}[yshift=1.5cm, xshift=0cm]
    %   \lineann{0}{1}{$r(x)$};
    % \end{scope}


\end{tikzpicture}\end{document}