Which of the following best describes the use of a non-continuous/dashed lines in engineering drawing?
To indicate hidden outlines and edges
In engineering drawing, different line types have fixed meanings so a drawing can be read unambiguously.
A continuous (solid) thick line represents visible outlines and edges that can actually be seen on the object.
A non-continuous, short-dashed line represents features that lie behind other surfaces and cannot be seen directly, that is, the hidden outlines and edges of the object.
Dimension and extension lines are thin continuous lines and cutting planes use a long chain line, so those meanings do not belong to short dashed lines.
Hence, the answer is To indicate hidden outlines and edges.
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