GENERAL allows you to choose a set of entities (excluding
points) whose projections define a closed region in the
current view.

Choose a Selection Menu option to specify a set of
entities. As with crosshatching, islands can be chosen
that will be excluded (or included) as required.

If the selected entities do not form a closed shape, they
are rejected and you are prompted to press <Enter> to
continue. Choose from the Selection Menu once again and
reselect the desired entities.

Enter a panel width value and press <Enter>. To assign the
default width value in parentheses, press <Enter>. These
rectangular shapes (referred to as panels) approximate the
area used in calculating the moment of the selected shape.

A smaller width value generates more panels within the
shape, therefore adding more accuracy to the moment value.
Locate the polar reference axis. The polar reference axis 
is defined as a vector pointing out of the screen and 
passing through the projection of the selected point to 
the current view.

The panels are created within the selected shape, and the
polar moment of inertia is calculated and displayed.

Press <Enter> to successively display the two components of
the polar moment with respect to orthogonal axes through 
the polar position. Choose the BACK-UP option to redisplay
the previous value.

Press <Enter> after the last component displayed to choose 
a new reference axis.

To clear temporary markers and panels from the screen,
redraw screen.
