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import graph3;
unitsize(1cm);
currentprojection=orthographic(10,5,5);
triple O=(0,0,0),N=(0,0,10),A=(8.66,0,-5), B=(-4.33,7.5,-5),C=(-4.33,-7.5,-5);
path3[] D=N--A--B--C--N--B^^A--C;
draw(surface(A--B--C--cycle),.5*blue+.5*white+opacity(.5));
draw(surface(N--B--C--cycle),.5*green+.5*white+opacity(.5));
draw(surface(N--C--A--cycle),.5*yellow+.5*white+opacity(.5));
draw(surface(N--A--B--cycle),.5*red+.5*white+opacity(.5));
draw(D,blue+1bp);
dot(D);dot(O);
label("$O$",O,E);label("$N$",N,N);label("$A$",A,SE);label("$B$",B,E);label("$C$",C,W+S);