%Draw with radius
\pgfmathparse{3}\let\R\pgfmathresult;

\coordinate (O) at (0,0);

%Points P and Q on unit circle, defined by the angle
\pgfmathparse{30}  \let\ThetaP\pgfmathresult;
\pgfmathparse{110} \let\ThetaQ\pgfmathresult;

\coordinate (P) at (\ThetaP:\R);
\coordinate (Q) at (\ThetaQ:\R);

\draw (O) circle(\R);

\draw (O) -- (P) -- (Q) -- cycle;

\fill[white] (P) circle(2pt);
\draw (P) circle(2pt);
\fill[white] (Q) circle(2pt);
\draw (Q) circle(2pt);

\input{Figs/Klein.Tangents.tikz}
