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Where a dimension is given for reference only and is not to be worked to, it is

  • A.omitted from the drawing altogether
  • B.placed in parentheses
  • C.underlined with a thick line
  • D.written in a larger character size

Answer: B

Correct answer: placed in parentheses

A reference dimension is given for convenience - an overall length that is the sum of others, say - and is not itself to be worked to or inspected. Parentheses mark it as such, so the reader knows the figure is derived. It preserves the rule that each dimension is stated once while still letting a useful total be shown.

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