Applying Linetype
In traditional drafting you draw short interrupted line segments when you want to indicate what is called a hidden line. Hidden lines represent objects that are above the section plane. Examples, including upper cabinets, high shelves, or a roof edge, are shown as hidden because they are above an imaginary section line cutting the building horizontally.
In AutoCAD, lines are not interrupted (broken into multiple little pieces) to indicate hidden lines. Instead, continuous lines are assigned a linetype and this style makes lines appear as if they are interrupted. One advantage to this is that you can adjust the scale of the line breaks without having to redraw myriad little lines. Let's explore linetype and linetype scale:
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