% Dans le préambule
% -----------------
\usepackage{tikz}
% -----------------

\begin{tikzpicture}
\draw (1,1) circle (0.75);
\draw [red,->] (1,1)++(-45:0.9) arc (-45:45:0.9);

\draw (3,1)--++(45:0.8) arc(45:315:0.8)--cycle;
\draw[fill=red] (3.2,1)--++(-45:0.8)
                        arc(-45:45:0.8)--cycle;
\end{tikzpicture}