\begin{pspicture}*(-6.5,-9.5)(9.5,3.5)
      \psset{algebraic=true}
      %\psgrid[subgriddiv=2, gridcolor = lightgray](-6.5,-9.5)(9.5,3.5)



	  \psdot(0,0)
	  \uput[u](0,0){$O$}

	  \uput[u](-2,3){$A$}
	  \uput[u](2,3){$B$}
	  \uput[r](9,-3){$C$}
	  \uput[d](-6,-3){$D$}
	  \uput[d](-2,-3){$E$}
	  \uput[d](2,-3){$F$}
	  \uput[r](9,-9){$G$}
	  \uput[u](5.5,-3){$I$}
	  %\uput[d](0,-3){$J$}
	  \uput[r](7,-5.5){$H$}

	  % AE
	  \psline(-2,3)(-2,-3)
	  % BF
	  \psline(2,3)(2,-3)
	  % AF
	  \psline(-2,3)(2,-3)
	  % BE
	  \psline(2,3)(-2,-3)
	  % % OJ
	  % \psline(0,0)(0,-3)
	  % FG
	  \psline(2,-3)(9,-9)
	  % BG
	  \psline(2,3)(9,-9)
	  % GC
	  \psline(9,-3)(9,-9)
	  % FH
	  \psline(2,-3)(6.95,-5.5)
	  % HC
	  \psline(6.95,-5.5)(9,-3)

	  % L'angle IFH
	  \psarc{<->}(2,-3){2}{-26}{0}
	  \uput[r](4,-3.5){$30^o$}

	  \pspolygon(-2,-3)(-2.2,-3)(-2.2,-2.8)(-2,-2.8)
	  \pspolygon(2,-3)(2.2,-3)(2.2,-2.8)(2,-2.8)
	  \pspolygon(-2,3)(2,3)(9,-3)(-6,-3)

	  \uput[u](0,3){4cm}
	  \uput[u](7,-3){3,5cm}
	  \uput[u](-4,-3){4cm}
	  \uput[r](2,0){6cm}

  \end{pspicture}