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Which type is the line A in the following figure?

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in Civil Engineering Drawing by (128k points)
Which type is the line A in the following figure?

(a) Dimension line

(b) Extension line

(c) Centre line

(d) Short-break line

This question was addressed to me in an online quiz.

The doubt is from Lines, Lettering and Dimensioning topic in chapter Lettering Practice, Scales & Curves of Civil Engineering Drawing

1 Answer

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Best answer
The correct option is (c) Centre line

To elaborate: Centre line is used to indicate the axes of cylindrical, conical or spherical objects.  Also to show the centre of circle and arcs. Long, thin chain line composed of alternate long and dot spaces approximately 1mm apart. Long dashes are about 9 to 12mm apart.

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