\psset{PointSymbol=none}
\pstGeonode[PosAngle={180,130,-90}, PointSymbol={default,none}]
           (2,0){B}(0,1){O}(1,4){A}
\pstLineAB[nodesepB=-1, linecolor=red]{O}{A}
\pstLineAB[nodesepB=-1, linecolor=red]{O}{B}
\pstInterLC[PointSymbolA=none, PosAngleB=-45]{O}{B}{O}{A}{G}{C}
\psset{arcsepA=-1, arcsepB=-1}
\pstArcOAB[linecolor=green, linestyle=dashed]{O}{C}{A}
\pstInterCC[PointSymbolB=none, PointNameB=none, PosAngleA=100]{A}{O}{C}{O}{O'}{OO}
\pstArcOAB[linecolor=blue, linestyle=dashed]{A}{O'}{O'}
\pstArcOAB[linecolor=blue, linestyle=dashed]{C}{O'}{O'}
\pstLineAB[nodesepB=-1, linecolor=cyan]{O}{O'}
\psset{arcsep=\pslinewidth, linecolor=magenta, Mark=MarkHash}
\pstMarkAngle{C}{O}{O'}{}
\pstMarkAngle[MarkAngleRadius=.5]{O'}{O}{A}{}