Discussion
Match the scale with what it does.
1. Diagonal scale 2. Comparative scale 3. Scale of chords
P. Reads a length in two systems of units Q. Reads three successive units of one system R. Sets out and measures angles
Answer: A
Each construction answers a different need, and choosing the wrong one either loses precision or cannot make the reading at all. The diagonal scale is the workhorse for lengths and the chord scale the substitute for a protractor.
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