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From the following figure, which is the repetitive dimension?

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From the following figure, which is the repetitive dimension?

(a) 30

(b) 70

(c) 10

(d) 20

This question was addressed to me in examination.

I need to ask this question from Basic Principles in Dimensioning -1 topic in division Lines, Lettering and Dimensioning of Engineering Drawing

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Right choice is (c) 10

For explanation I would say: From the front view it is clear that the circle has diameter 20 mm. Hence its radius will be 10mm. The dimension 10mm in the side view is just a repetition of this information. Repetitive dimensions are redundant and they need to be avoided.

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