\PGset[0.8em]
\begin{picture}(18,10)

% 450x238
% 16x9

% C = 7.5,7
% A = 11,1

\drawline(11,1)(17,1)(7.5,7)(11,1) % ABCA

% mAF = mM'C = .923, A=11,1
% mBC = -.6315, B = 17,1
\dashline[80]{0.2}(1,1)(11,1)(13.437,3.25) % M'AF

% Ex = 4, Ey = 9.21
\drawline(1,1)(7.5,7)(4,9.21) % M'CE


\put( 10.6,  0.2 ){$\scriptstyle A$}
\put( 17.1,  0.9 ){$\scriptstyle B$}
\put(  7.6,  7.1 ){$\scriptstyle C$}
\put(  3.2,  9.0 ){$\scriptstyle E$}
\put( 13.4,  3.4 ){$\scriptstyle F$}
\put(  0.0,  0.9 ){$\scriptstyle M'$}

\end{picture}
\PGrestore