\PGset[0.8em]
\begin{picture}(10,8)

\drawline(1,3)(10,3) % AB

\dashline[80]{0.2}(2.5,5)(2.5,1)(9.7,6) % PDQ mDQ = .694

\dashline[80]{0.2}(2.5,5)(5.38,3) % PE
\dashline[80]{0.2}(2.5,1)(8,3)(9.7,6) % DFQ
\dashline[80]{0.2}(2.5,5)(8,3) % PF


\put( 0.6, 2.2){$\scriptstyle A$}
\put( 9.4, 2.2){$\scriptstyle B$}
\put( 1.7, 2.2){$\scriptstyle C$}
\put( 2.1, 0.2){$\scriptstyle D$}
\put( 5.2, 2.2){$\scriptstyle E$}
\put( 7.7, 2.2){$\scriptstyle F$}
\put( 2.2, 5.2){$\scriptstyle P$}
\put( 9.8, 5.8){$\scriptstyle Q$}

\end{picture}
\PGrestore