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If there is a need for the center line, then it can be used as a _____

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If there is a need for the center line, then it can be used as a _____

(a) Dimension line

(b) Leader line

(c) Extension line

(d) Section line

This question was posed to me in quiz.

Enquiry is from Basic Principles in Dimensioning -1 in section Lines, Lettering and Dimensioning of Engineering Drawing

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The correct choice is (c) Extension line

To explain I would say: The center line can be used as an extension line. With the help of the center line as an extension line, we can dimension the distance between the centers of the circles from the outline view of the object. This helps in drawing the circle accurately.

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