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The routine geom3d[xcoord] returns the x-coordinate of the given point P.

The routine geom3d[ycoord] returns the y-coordinate of the given point P.

The routine geom3d[zcoord] returns the z-coordinate of the given point P.

The command with(geom3d,xcoord) allows the use of the abbreviated form of this command.

Similarly for the routines geom3d[ycoord] and geom3d[zcoord].

$\mathrm{with}\left(\mathrm{geom3d}\right)\:$

$\mathrm{point}\left(A\,2\,8\,1\right),\mathrm{point}\left(M\,\left[u\,v\,w\right]\right)$

$A,M$

$\mathrm{xcoord}\left(A\right)$

$2$

$\mathrm{ycoord}\left(A\right)$

$8$

$\mathrm{zcoord}\left(M\right)$

$w$