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\psset{PointSymbol=none}
\pstTriangle[PointSymbol=none](-2,-1){A}(1,2){B}(2,0){C}
% ñèìåòðàëè
{% encapsulation de modif paramètres
\psset{linestyle=none, PointNameB=none}
\pstMediatorAB{A}{B}{K}{KP}
\pstMediatorAB[PosAngleA=-40]{C}{A}{J}{JP}
\pstMediatorAB[PosAngleA=75]{B}{C}{I}{IP}
}% fin
\pstInterLL[PointSymbol=square,PosAngle=-170]{I}{IP}{J}{JP}{O}
{% encapsulation de modif paramètres
\psset{nodesep=-.8, linecolor=green}
\pstLineAB{O}{I}\pstLineAB{O}{J}\pstLineAB{O}{K}
}% fin
\pstCircleOA[linecolor=red]{O}{A}
% ñèìâîëúò íà O å êâàäðàò
\psdot[dotstyle=square](O)
% âèñî÷èíè è îðòîöåíòúð
\pstProjection{B}{A}{C}
\pstProjection{B}{C}{A}
\pstProjection{A}{C}{B}
\psset{linecolor=blue}\ncline{A}{A'}\ncline{C}{C'}\ncline{B}{B'}
\pstInterLL[PointSymbol=square]{A}{A'}{B}{B'}{H}
% ìåäèàíè è öåíòúð íà ãðàâèòàöèÿ
\psset{linecolor=magenta}\ncline{A}{I}\ncline{C}{K}\ncline{B}{J}
\pstCGravABC[PointSymbol=square,PosAngle=95]{A}{B}{C}{G}
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