The routine returns the form of the given object supported by the geometry package. It returns point2d, segment2d, dsegment2d, line2d, triangle2d, square2d, circle2d, ellipse2d, parabola2d, hyperbola2d, or FAIL if it is unable to recognize the object.

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

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

$\mathrm{point}\left(A\,0\,0\right),\mathrm{point}\left(B\,1\,1\right)\:$

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

$\mathrm{point2d}$

$\mathrm{line}\left(l\,\left[A\,B\right]\right)$

$l$

$\mathrm{form}\left(l\right)$

$\mathrm{line2d}$