\PGset[0.8em]
\begin{picture}(12,12)

% Ellipse:  u = 6.0  v = 6.0  a = 5.0  b = 5.0  phi = 0.0 Grad
\qbezier[20](11.0, 6.0)(11.0, 8.0711)(9.5355, 9.5355)
\qbezier[20](9.5355, 9.5355)(8.0711, 11.0)(6.0, 11.0)
\qbezier[20](6.0, 11.0)(3.9289, 11.0)(2.4645, 9.5355)
\qbezier[20](2.4645, 9.5355)(1.0, 8.0711)(1.0, 6.0)
\qbezier[20](1.0, 6.0)(1.0, 3.9289)(2.4645, 2.4645)
\qbezier[20](2.4645, 2.4645)(3.9289, 1.0)(6.0, 1.0)
\qbezier[20](6.0, 1.0)(8.0711, 1.0)(9.5355, 2.4645)
\qbezier[20](9.5355, 2.4645)(11.0, 3.9289)(11.0, 6.0)


\drawline(1.101,7)(10.9,7)(9,10)(1.101,7) % MPNM

% angle MNP = 69.203 + 32.347 = 101.551
% MNQ = 50.775, mNQ = 3.001
\dashline[80]{0.2}(9,10)(6,1)(10.9,7) % NQP


\put( 0.2, 6.7 ){$\scriptstyle M$}
\put( 8.9,10.2 ){$\scriptstyle N$}
\put( 7.0, 6.2 ){$\scriptstyle O$}
\put(11.0, 6.7 ){$\scriptstyle P$}
\put( 5.5, 0.2 ){$\scriptstyle Q$}

\put( 6.7, 2.4 ){$\scriptstyle a$}
\put( 8.9, 9.0 ){$\scriptstyle b$}
\put( 2.9, 7.1 ){$\scriptstyle a'$}
\put( 8.1, 9.0 ){$\scriptstyle b'$}


\end{picture}
\PGrestore