Almost always, unless you are exporting the linework to another program. Some other programs don't like AutoCAD polylines, and prefer lines.
On the other hand, polylines can contain data/features that lines can't, such as width and curves.
With GStarICAD, a polyline is a connected sequence of arcs and lines that is treated as a single entity. You can draw a polyline with any linetype and using a width that either remains constant or tapers over the length of any segment. When editing a polyline, you can modify the entire polyline or change individual segments. After you specify the start point of a polyline, a prompt box provides several options as you draw, such as Distance, Halfwidth, and Width. You can specify different starting and ending widths to create a tapered polyline segment. After you draw at least one polyline segment, you can use the Undo option to remove the previous segment. After you draw two or more polyline segments, you can use the Close option to complete the command by drawing a segment that ends at the start point of the first polyline segment you drew. Choose Done to complete the command without closing the polyline.
You can create a series of line segment using LINE command A line consists of two points: a start point and an endpoint. You can connect a series of lines, but each line segment is considered a separate line entity. In a simple line which is connected by several line segment,each line segment is considered a separate line entity,each line segment can be editted seperately and doesn't effect other line segment. You can specify line properties,including color.line type. Use polyline objects instead of line objects if you want the segments to be connected as a single object.
America uses both
Create a closed polyline form the points and use the AREA command to calculate the area and perimeter.
if you mess up you can erase it
They use a line stright down instead of going across.
Not easily. You can't get a clean line becaue of the nap. I would suggest you use a stamping technique instead.
(DCCL)I or instead of the parenthesis, you can use a line over the top, but I can't write that on here. Both parenthesis and a line above indicate x1000
as reported by, as stated in, conforming to, in agreement with, in consonance with, in keeping with, in line with, just as, pursuant to, to the degree that
You use a line chart to show changes over time, for the same value. The line goes up or down, depending on the change over time. A column chart is more commonly used to compare independent values.
pie graphs show volume and are good for showing the relationship of size. line graphs are good for showing trends which can lead to predictions.
INSTEAD