PARC                                                               Menu: POLYG
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Continues the current polygon by creating an arc.

        1.   (POINT) second point of arc
        2.   (POINT) last point of arc
        3. * (POINT) next point of polygon
             (press <ENTER> to close polygon)

Description:
This command creates an arc in the current polygon, starting from the last
polygon point and passing through two more points. Pick the second point and
the last point of the arc. The arc is displayed and the system asks you for
the next polygon point. This command is valid only while working on the
current polygon.
In order to start a polygon with an arc, use the \newp command, picking the
first point; then use the \parc command. You can create a full circle by using
this command twice. (See also \prcir and \pcirc commands.)
In order to close the polygon (as in \endp), press <ENTER>.
