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A scale of chords is used to

  • A.measure lengths in two systems of units at once
  • B.read three successive units from one scale
  • C.correct a drawing for the shrinkage of the sheet
  • D.set out and measure angles without a protractor

Answer: D

Correct answer: set out and measure angles without a protractor

A scale of chords gives the chord length subtending each angle at a circle of a chosen radius, so an angle is constructed by striking an arc of that radius and stepping off the chord taken from the scale. It is the classical means of setting out angles with dividers alone, and it is exact rather than approximate.

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