\psset{linecolor=blue, linewidth=2\pslinewidth}
\psplot{-10}{-.1}{1 x div}
\psplot{.1}{10}{1 x div}
\psset{PointSymbol=none, linewidth=.5\pslinewidth}
\pstTriangle[linecolor=magenta, PosAngleB=-85, 
        PosAngleC=-90](.2,5){A}(1,1){B}(10,.1){C}
%\pstTriangle[linecolor=magenta, 
%PosAngleB=-135](.2, 5){A}(-1,-1){B}(10,.1){C}
\psset{linecolor=magenta, CodeFig=true, CodeFigColor=red}
\pstProjection{B}{A}{C}
\ncline[nodesepA=-1, linestyle=dashed, linecolor=magenta]{C'}{B}
\pstProjection{B}{C}{A}
\ncline[nodesepA=-1, linestyle=dashed, linecolor=magenta]{A'}{B}
\pstProjection{A}{C}{B}
\pstInterLL[PosAngle=135, PointSymbol=square]{A}{A'}{B}{B'}{H}
\psset{linecolor=green, nodesep=-1}
\pstLineAB{A}{H}\pstLineAB{B'}{H}\pstLineAB{C}{H}
\psdot[dotstyle=square](H)