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Identify the ‘a’ in the given picture

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Identify the ‘a’ in the given picture

(a) dimension line

(b) hidden line

(c) centre line

(d) outline

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I'm obligated to ask this question of Terminology of Dimensioning in section Lines, Lettering and Dimensioning of Engineering Drawing

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Best answer
The correct choice is (c) centre line

Best explanation: Centre line usually represents the centre of circle, the axis of cylindrical objects, lines of symmetry, trajectories, pitch circle of gears and pitch circle of holes, represented by chain thin long-dashed dotted (narrow).

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