% Diagram by nilrem for PGDP project: Plane Geometry by G.A. Wentworth
% ***  Uses  epic  package   ***
% 083aaZ83.tex
% Ex.83. Fig.a.   (10, 9 )
\PGset[0.8em]
\begin{picture}   (10, 9 )
\drawline       ( 1  , 1  )( 9  , 1  )( 8  , 8  )( 3  , 8  )( 1  , 1  )  %ABCDA
\drawline       ( 1  , 1  )( 8  , 8  )  %AC
\drawline       ( 9  , 1  )( 3  , 8  )  %BD
\drawline       ( 4.5, 4.5)( 6  , 4.5)  %EF
\dashline[80]{0.2}  ( 4  , 1  )( 8  , 8  )  %GC
\put(  0.3 ,  0.2 ){$\scriptstyle A$}   %A
\put(  8.8 ,  0.2 ){$\scriptstyle B$}   %B
\put(  7.7 ,  8.2 ){$\scriptstyle C$}   %C
\put(  2.6 ,  8.2 ){$\scriptstyle D$}   %D
\put(  3.5 ,  4.2 ){$\scriptstyle E$}   %E
\put(  6.2 ,  4.2 ){$\scriptstyle F$}   %F
\put(  3.5 ,  0.2 ){$\scriptstyle G$}   %G
\end{picture}
\PGrestore
%
\hspace{-0.5em} %keeps these diagrams within margins
%
% 083bbZ83.tex
% Ex.83. Fig.b.   (10, 6 )
\PGset[0.8em]
\begin{picture}   (10, 6 )
\drawline       ( 1  , 1  )(9  , 1  )( 8  , 5  )( 2  , 5  )( 1  , 1  )  %ABDCA
\dashline[80]{0.2}  ( 2  , 5  )( 3  , 1  )  %CE
\put(  0.3 ,  0.2 ){$\scriptstyle A$}   %A
\put(  8.8 ,  0.2 ){$\scriptstyle B$}   %B
\put(  1.7 ,  5.2 ){$\scriptstyle C$}   %C
\put(  7.6 ,  5.2 ){$\scriptstyle D$}   %D
\put(  2.5 ,  0.2 ){$\scriptstyle E$}   %E
\end{picture}
\PGrestore
%
\hspace{-0.5em} %keeps these diagrams within margins
%
% 083ccZ83.tex
% Ex.83. Fig.c.   (12, 7 )
\PGset[0.8em]
\begin{picture}   (12, 7 )
\drawline       ( 1  , 1  )(11  , 1  )( 9  , 6  )( 3  , 6  )( 1  , 1  )  %ABCDA
\put(  0.3 ,  0.2 ){$\scriptstyle A$}   %A
\put( 10.8 ,  0.2 ){$\scriptstyle B$}   %B
\put(  8.7 ,  6.2 ){$\scriptstyle C$}   %C
\put(  2.6 ,  6.2 ){$\scriptstyle D$}   %D
\end{picture}
\PGrestore
%
\hspace{-0.5em} %keeps these diagrams within margins
%
% 083ddZ83.tex
% Ex.83. Fig.d.   (11, 6 )
\PGset[0.8em]
\begin{picture}   (11, 6 )
\drawline       ( 1  , 1  )(10  , 1  )( 8  , 5  )( 3  , 5  )( 1  , 1  )  %ABCDA
\drawline       ( 1  , 1  )( 8  , 5  )  %AC
\drawline       (10  , 1  )( 3  , 5  )  %BD
\put(  0.3 ,  0.2 ){$\scriptstyle A$}   %A
\put(  9.8 ,  0.2 ){$\scriptstyle B$}   %B
\put(  7.7 ,  5.2 ){$\scriptstyle C$}   %C
\put(  2.6 ,  5.2 ){$\scriptstyle D$}   %D
\end{picture}
\PGrestore