Discussion
Three of the following require the representative fraction to be known. The exception is
Answer: B
Correct answer: measuring an angle with a scale of chords
A scale of chords works from a circle of a chosen radius and gives angles directly; the representative fraction of the drawing plays no part in it, which is why the same scale of chords serves drawings at any scale. The other three all involve converting between drawing and actual lengths, which is precisely what the fraction is for.
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