![]() ![]() Short and long break lines: Break lines remove a section of a drawing for clarity, and shorten objects that are too long to fit on the drawing.Arrowheads at each end show where the dimension lines end at the extension lines. ![]() Dimension and extension lines: The dimension line is thin and solid, indicating the size of an object.Centerline: Used to indicate the centers of holes, arcs, and symmetrical objects, the center line is a very thin long-short-long line. ![]() It is a medium-weight line consisting of short dashes about 1/8" long with 1/16" gaps. Hidden line: The hidden line shows edges, surfaces, and corners that cannot be seen. ![]()
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