% Diagram by nilrem for PGDP project: Plane Geometry by G.A. Wentworth
% ***  Uses  epic  &  eepic  packages   ***
% 117bb105.tex
% Ex.105. Fig.b.   ( 7.4, 5.6 )
\PGset[0.8em]
\begin{picture}    ( 7.4, 5.6 )

% Ellipse:  u = 3.7  v = 2.8  a = 2.7  b = 2.7  phi = 0.0 Grad
\qbezier(6.4, 2.8)(6.4, 3.9184)(5.6092, 4.7092)
\qbezier(5.6092, 4.7092)(4.8184, 5.5)(3.7, 5.5)
\qbezier(3.7, 5.5)(2.5816, 5.5)(1.7908, 4.7092)
\qbezier(1.7908, 4.7092)(1.0, 3.9184)(1.0, 2.8)
\qbezier(1.0, 2.8)(1.0, 1.6816)(1.7908, 0.8908)
\qbezier(1.7908, 0.8908)(2.5816, 0.1)(3.7, 0.1)
\qbezier(3.7, 0.1)(4.8184, 0.1)(5.6092, 0.8908)
\qbezier(5.6092, 0.8908)(6.4, 1.6816)(6.4, 2.8)

%\put          ( 3.7  , 2.75  ){\circle*{ 0.05}}     %circle dot center (part of dashed line)
\drawline     ( 1    , 2.8   )( 6.4  , 2.8   )    %C(OA)B
\drawline     ( 5.3  , 2.8   )( 6.208, 1.8   )    %AD
\dashline[80]{0.2}( 3.7  , 2.8   )( 6.208, 1.8   )    %OD
\put(  5   ,  3   ){$\scriptstyle A$}   %A
\put(  6.5 ,  2.5 ){$\scriptstyle B$}   %B
\put(  0.1 ,  2.5 ){$\scriptstyle C$}   %C
\put(  6.2 ,  1.3 ){$\scriptstyle D$}   %D
\put(  3.5 ,  3   ){$\scriptstyle O$}   %O
\end{picture}
\PGrestore