documentclass{standalone}
usepackage{pstricks-add}
begin{document}
psset{xunit=1.0cm,yunit=1.0cm,algebraic=true,dotstyle=*,dotsize=3pt 0,linewidth=0.8pt,arrowsize=3pt 2,arrowinset=0.25}
begin{pspicture*}(-2.37,-0.3)(6.25,4.31)
psline(1.56,0.36)(4.66,1.76)
psline(0.68,1.36)(2.68,0.87)
psline(0.68,3.92)(2.68,0.87)
psline(2.49,1.15)(2.82,1.3)
psline(2.82,1.3)(3.01,1.01)
psline(1.82,0.8)(2.28,0.69)
psline(1.82,0.8)(2.22,0.98)
psline(0.68,3.92)(0.68,1.36)
psline(0,2)(-2,0)
psline(0,2)(6,2)
psline(6,2)(4,0)
psline(4,0)(-2,0)
parametricplot{0.0}{0.7853981633974483}{1*0.91*cos(t)+0*0.91*sin(t)+-2|0*0.91*cos(t)+1*0.91*sin(t)+0}
psline(-2,0)(4,0)
psline(1,1.58)(0.68,1.66)
psline(1,1.58)(1,1.28)
rput[tl](2.69,0.79){H}
rput[tl](0.51,1.27){K}
psdots(1.56,0.36)
rput[bl](1.7,0.15){$A$}
psdots(4.66,1.76)
rput[bl](4.7,1.5){$B$}
psdots(0.68,3.92)
rput[bl](0.74,3.99){$M$}
rput[bl](-1.53,0.12){$beta$}
end{pspicture*}
end{document}