1036 \mathfig{0.4}{triangle/triangle4f_i}

  1036 \begin{tikzpicture}

  1037 \node[circle,fill=black,inner sep=1pt] (A) at (1.73,0) {};

  1038 \node[circle,fill=black,inner sep=1pt] (B) at (-1.73,0) {};

  1039 \draw[dashed] (A) -- (B);

  1040 \node[circle,fill=black,inner sep=1pt] (C) at (0,0) {};

  1041 \node[circle,fill=black,inner sep=1pt] (D) at (0.8,0) {};

  1042 \begin{scope}[yshift=-1cm]

  1043 \path[clip] (0,0) circle (2);

  1044 \begin{scope}[yshift=2cm]

  1045 \draw (0,0) circle (2);

  1046 \node[circle,fill=black,inner sep=1pt] (L2) at (-90:2) {};

  1047 \node[circle,fill=black,inner sep=1pt] (L1) at (-120:2) {};

  1048 \end{scope}

  1049 \end{scope}

  1050 \begin{scope}[yshift=1cm]

  1051 \path[clip] (0,0) circle (2);

  1052 \begin{scope}[yshift=-2cm]

  1053 \draw (0,0) circle (2);

  1054 \node[circle,fill=black,inner sep=1pt] (U) at (90:2) {};

  1055 \end{scope}

  1056 \end{scope}

  1057 \begin{scope}

  1058 \path[clip] (0,1) circle (2);

  1059 \path[clip] (0,-1) circle (2);

  1060 \foreach \n in {1,...,6} {

  1061 	\path (B) to[out=0,in=-180] node[coordinate,pos=\n/6] (BC\n) {} (C);

  1062 	\draw[green!50!brown] (BC\n) -- +(0,1);

  1063 	\draw[green!50!brown] (BC\n) -- +(-1.5,-1);

  1064 }

  1065 \foreach \n in {0,...,5} {

  1066 	\path (C) to[out=0,in=-180] node[coordinate,pos=\n/5] (CD\n) {} (D);

  1067 	\path (L1) to[out=-30,in=-180] node[coordinate,pos=\n/5] (L1L2\n) {} (L2);

  1068 	\draw[blue] (CD\n) -- (L1L2\n);

  1069 }

  1070 \foreach \n in {0,...,5} {

  1071 	\path (L1) to[out=40,in=-140] node[coordinate,pos=\n/5] (L1C\n) {} (C);

  1072 	\path (L2) to[out=50,in=-130] node[coordinate,pos=\n/5] (L2D\n) {} (D);

  1073 	\draw[blue] (L1C\n) -- (L2D\n);

  1074 }

  1075 \foreach \n in {1,3,...,9} {

  1076 	\path(C) to[out=30,in=150] node[coordinate,pos=\n/10] (CA\n) {} (A);

  1077 	\path(D) to[out=0,in=180] node[coordinate,pos=\n/10] (DA\n) {} (A);

  1078 	\path(L2) to[out=0,in=-120] node[coordinate,pos=\n/10] (L2A\n) {} (A);

  1079 	\draw[brown] (CA\n) -- +(0,1);

  1080 	\draw[brown] (CA\n) to[out=0] (DA\n) -- (L2A\n);

  1081 }

  1082 \draw[dashed] (U) -- (C) -- (L1) (L2) -- (D);

  1083 \end{scope}

  1084 \end{tikzpicture}