\documentclass{article}
\usepackage{graphicx}
\usepackage{float}
\usepackage{tikz}
\begin{document}

\begin{tikzpicture} [scale=3]
  \draw [thick] (1, 0) -- (0.5, 0.866) -- (-0.5, 0.866) -- (-1, 0) -- (-0.5, -0.866) -- (0.5, -0.866) -- (1, 0);
  \draw [thick] (1,0) -- (-1,0);
  \draw [thick] (0.5, 0.866) -- (-0.5, -0.866);
  \draw [thick] (-0.5, 0.866) -- (0.5, -0.866);
  \node at (-0.600,  1) {sin};
  \node at ( 0.600,  1) {cos};
  \node at ( 1.200,  0) {cot};
  \node at ( 0.600, -1) {csc};
  \node at (-0.600, -1) {sec};
  \node at (-1.200,  0) {tan};
  \node at (0, 0.5) {I};
  \node at (-0.5, -0.3) {II};
  \node at (0.5, -0.3) {III};  
\end{tikzpicture}

\begin{tikzpicture} [scale=3]
  \draw [thick] (1, 0) -- (0.5, 0.866) -- (-0.5, 0.866) -- (-1, 0) -- (-0.5, -0.866) -- (0.5, -0.866) -- (1, 0);
  \draw [thick] (1,0) -- (-1,0);
  \draw [thick] (0.5, 0.866) -- (-0.5, -0.866);
  \draw [thick] (-0.5, 0.866) -- (0.5, -0.866);
  \node at (-0.600,  1) {tanh};
  \node at ( 0.600,  1) {sech};
  \node at ( 1.200,  0) {csch};
  \node at ( 0.600, -1) {coth};
  \node at (-0.600, -1) {cosh};
  \node at (-1.200,  0) {sinh};
  \node at (0, 0.5) {I};
  \node at (-0.5, -0.3) {II};
  \node at (0.5, -0.3) {III};  
\end{tikzpicture}

\end{document}
