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The Line command will create a line segment immediately when the start and the end points are specified,
and can be chained up to create line segments. Each line segment is separated with others and can be
selected separately. Set the end point of the last line segment to the start point of the first one, choose all the
line segments, and then select the command Combine near to make them a closed contour.
On the other hand, the Polyline command will not create the polyline (composed by line or arc segments)
until you complete the command by selecting commands in the context menu or entering commands in the
Draw command window. Select the command OK in the context menu, the polyline will be closed
automatically if the end point is set to the start point, otherwise, the segments in the polyline are connected
with each other but the polyline itself will be treated as an open contour. Or, select or enter the command
Close in the context menu or in the Draw command window, and the software will close the polyline
automatically by connecting the end and the start points by a line or an arc segment according to the current
choice of the command.
In general, we recommend using the Polyline function, other than a combination of the Line and the Arc
function, to construct parts because it usually expresses human intent better and need fewer post procedures
to finish the job.
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