% Drawing generated by LaTeX-CAD 1.9 - requires latexcad.sty 
% (c) 1998 John Leis leis@usq.edu.au 
\begin{picture}(172,108)
\thinlines
\drawvector{4.0}{50.0}{162.0}{1}{0}
\drawvector{98.0}{8.0}{94.0}{0}{1}
\drawvector{14.0}{96.0}{0.0}{0}{1}
\drawdot{118.0}{50.0}
\drawdot{98.0}{70.0}
\drawdot{98.0}{30.0}
\drawdot{108.0}{50.0}
\drawpath{98.0}{70.0}{98.0}{70.0}
\drawpath{138.0}{66.0}{138.0}{66.0}
\drawpath{118.0}{8.0}{118.0}{98.0}
\drawcenteredtext{94.0}{46.0}{$O$}
\drawcenteredtext{106.0}{46.0}{$S(\Frac{p}{2},0)$}
\drawcenteredtext{122.0}{80.0}{$D$}
\drawcenteredtext{118.0}{88.0}{$H$}
\drawcenteredtext{94.0}{66.0}{$A(0,p)$}
\drawcenteredtext{94.0}{34.0}{$B(0,-p)$}
\drawcenteredtext{122.0}{70.0}{$a$}
\drawcenteredtext{122.0}{30.0}{$b$}
\drawdotline{98.0}{70.0}{118.0}{70.0}
\drawdotline{98.0}{30.0}{118.0}{30.0}
\drawpath{108.0}{44.0}{108.0}{56.0}
\path(98.0,70.0)(98.0,70.0)(98.29,69.4)(98.58,68.81)(98.87,68.25)(99.16,67.69)(99.45,67.15)(99.75,66.61)(100.02,66.09)(100.3,65.58)
\path(100.3,65.58)(100.58,65.09)(100.86,64.61)(101.12,64.13)(101.38,63.66)(101.65,63.2)(101.91,62.75)(102.16,62.31)(102.41,61.9)(102.66,61.47)
\path(102.66,61.47)(102.9,61.06)(103.13,60.65)(103.37,60.27)(103.59,59.88)(103.81,59.5)(104.04,59.13)(104.25,58.75)(104.45,58.4)(104.66,58.04)
\path(104.66,58.04)(104.87,57.7)(105.05,57.36)(105.25,57.02)(105.43,56.68)(105.61,56.36)(105.77,56.04)(105.94,55.72)(106.09,55.41)(106.25,55.11)
\path(106.25,55.11)(106.4,54.79)(106.54,54.5)(106.66,54.2)(106.8,53.9)(106.91,53.61)(107.04,53.31)(107.13,53.02)(107.25,52.74)(107.33,52.45)
\path(107.33,52.45)(107.41,52.16)(107.5,51.88)(107.58,51.59)(107.63,51.31)(107.69,51.02)(107.75,50.75)(107.79,50.45)(107.81,50.16)(107.83,49.88)
\path(107.83,49.88)(107.86,49.59)(107.87,49.31)(107.87,49.0)(107.86,48.72)(107.84,48.41)(107.81,48.11)(107.79,47.81)(107.73,47.5)(107.69,47.2)
\path(107.69,47.2)(107.62,46.88)(107.55,46.56)(107.48,46.25)(107.38,45.91)(107.29,45.59)(107.19,45.25)(107.06,44.9)(106.94,44.56)(106.8,44.2)
\path(106.8,44.2)(106.66,43.84)(106.5,43.47)(106.33,43.09)(106.15,42.7)(105.95,42.31)(105.76,41.93)(105.55,41.52)(105.33,41.11)(105.09,40.68)
\path(105.09,40.68)(104.86,40.25)(104.59,39.81)(104.33,39.36)(104.05,38.9)(103.76,38.43)(103.47,37.95)(103.16,37.45)(102.83,36.95)(102.5,36.45)
\path(102.5,36.45)(102.15,35.91)(101.79,35.38)(101.41,34.84)(101.04,34.27)(100.63,33.7)(100.23,33.12)(99.8,32.52)(99.37,31.9)(98.93,31.29)
\path(98.93,31.29)(98.47,30.64)(98.0,30.0)(98.0,30.0)
\path(48.0,104.0)(48.0,104.0)(48.95,103.4)(49.9,102.8)(50.83,102.22)(51.75,101.63)(52.68,101.05)(53.59,100.48)(54.49,99.91)(55.38,99.36)
\path(55.38,99.36)(56.25,98.8)(57.13,98.26)(58.0,97.7)(58.84,97.16)(59.7,96.62)(60.52,96.09)(61.36,95.58)(62.18,95.05)(62.98,94.55)
\path(62.98,94.55)(63.77,94.04)(64.56,93.52)(65.36,93.04)(66.12,92.54)(66.88,92.05)(67.63,91.56)(68.38,91.08)(69.12,90.62)(69.84,90.15)
\path(69.84,90.15)(70.55,89.69)(71.26,89.23)(71.97,88.77)(72.66,88.33)(73.33,87.88)(74.0,87.45)(74.66,87.02)(75.31,86.59)(75.95,86.18)
\path(75.95,86.18)(76.58,85.76)(77.22,85.34)(77.83,84.94)(78.44,84.55)(79.02,84.16)(79.62,83.76)(80.19,83.37)(80.76,83.0)(81.33,82.62)
\path(81.33,82.62)(81.87,82.26)(82.41,81.9)(82.94,81.54)(83.48,81.19)(83.98,80.83)(84.48,80.5)(84.98,80.16)(85.48,79.83)(85.94,79.5)
\path(85.94,79.5)(86.41,79.18)(86.87,78.86)(87.33,78.55)(87.76,78.23)(88.19,77.94)(88.62,77.65)(89.02,77.36)(89.44,77.06)(89.83,76.79)
\path(89.83,76.79)(90.22,76.51)(90.58,76.23)(90.95,75.98)(91.31,75.72)(91.66,75.47)(92.0,75.22)(92.33,74.97)(92.65,74.73)(92.97,74.5)
\path(92.97,74.5)(93.26,74.26)(93.55,74.05)(93.84,73.83)(94.12,73.62)(94.38,73.41)(94.63,73.2)(94.88,73.01)(95.12,72.81)(95.34,72.63)
\path(95.34,72.63)(95.56,72.44)(95.77,72.27)(95.98,72.11)(96.18,71.94)(96.36,71.77)(96.52,71.62)(96.69,71.47)(96.84,71.33)(97.0,71.19)
\path(97.0,71.19)(97.12,71.05)(97.26,70.93)(97.37,70.8)(97.48,70.68)(97.58,70.56)(97.68,70.45)(97.76,70.36)(97.83,70.26)(97.9,70.16)
\path(97.9,70.16)(97.94,70.08)(98.0,70.0)(98.0,70.0)
\drawdot{76.0}{86.0}
\drawdot{118.0}{86.0}
\drawdotline{76.0}{86.0}{118.0}{86.0}
\drawdotline{76.0}{86.0}{98.0}{50.0}
\drawcenteredtext{72.0}{82.0}{$M$}
\path(48.0,4.0)(48.0,4.0)(48.95,4.34)(49.9,4.71)(50.83,5.07)(51.75,5.42)(52.68,5.76)(53.59,6.11)(54.49,6.47)(55.38,6.8)
\path(55.38,6.8)(56.25,7.15)(57.13,7.48)(58.0,7.82)(58.84,8.17)(59.7,8.51)(60.52,8.84)(61.36,9.17)(62.18,9.5)(62.98,9.82)
\path(62.98,9.82)(63.77,10.14)(64.56,10.46)(65.36,10.8)(66.12,11.11)(66.88,11.43)(67.63,11.75)(68.38,12.06)(69.12,12.36)(69.84,12.68)
\path(69.84,12.68)(70.55,12.98)(71.26,13.28)(71.97,13.59)(72.66,13.89)(73.33,14.18)(74.0,14.48)(74.66,14.78)(75.31,15.07)(75.95,15.36)
\path(75.95,15.36)(76.58,15.65)(77.22,15.94)(77.83,16.22)(78.44,16.51)(79.02,16.79)(79.62,17.06)(80.19,17.35)(80.76,17.63)(81.33,17.89)
\path(81.33,17.89)(81.87,18.17)(82.41,18.43)(82.94,18.7)(83.48,18.97)(83.98,19.22)(84.48,19.48)(84.98,19.75)(85.48,20.01)(85.94,20.27)
\path(85.94,20.27)(86.41,20.52)(86.87,20.77)(87.33,21.02)(87.76,21.27)(88.19,21.51)(88.62,21.75)(89.02,21.98)(89.44,22.22)(89.83,22.46)
\path(89.83,22.46)(90.22,22.7)(90.58,22.94)(90.95,23.17)(91.31,23.39)(91.66,23.62)(92.0,23.85)(92.33,24.06)(92.65,24.29)(92.97,24.51)
\path(92.97,24.51)(93.26,24.72)(93.55,24.95)(93.84,25.15)(94.12,25.37)(94.38,25.57)(94.63,25.79)(94.88,25.98)(95.12,26.19)(95.34,26.38)
\path(95.34,26.38)(95.56,26.59)(95.77,26.79)(95.98,26.98)(96.18,27.18)(96.36,27.37)(96.52,27.55)(96.69,27.75)(96.84,27.93)(97.0,28.11)
\path(97.0,28.11)(97.12,28.29)(97.26,28.46)(97.37,28.64)(97.48,28.82)(97.58,29.0)(97.68,29.17)(97.76,29.34)(97.83,29.51)(97.9,29.67)
\path(97.9,29.67)(97.94,29.82)(98.0,29.98)(98.0,30.0)
\drawcenteredtext{164.0}{46.0}{$x$}
\drawcenteredtext{94.0}{100.0}{$y$}
\drawcenteredtext{124.0}{54.0}{$(p,0)$}
\drawcenteredtext{64.0}{74.0}{$MO=MH$}
\drawframebox{63.0}{73.0}{30.0}{14.0}{}
\drawcenteredtext{72.0}{20.0}{$\mathcal{P}$}
\end{picture}
