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A comparative or corresponding scale is one drawn to

  • A.convert an area measurement into a volume
  • B.read the same length in two different systems of units
  • C.compare two drawings made at different scales
  • D.measure both lengths and angles on one instrument

Answer: B

Correct answer: read the same length in two different systems of units

Comparative scales are two scales drawn to the same representative fraction on a common base line, one graduated in each system, so a length set off on one can be read directly on the other. They are used where a drawing must serve users working in different units, and no arithmetic is needed to convert.

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