Discussion
Match the scale class with its representative fraction.
1. Full size 2. Reducing 3. Enlarging
P. Less than unity Q. Exactly unity R. Greater than unity
Answer: B
Correct answer: 1-Q, 2-P, 3-R
The three classes are distinguished by where the representative fraction sits relative to one. Full size is exactly unity, drawing length equalling actual length. A reducing scale gives a fraction below unity, an enlarging scale one above. The classification follows directly from the definition of the fraction as drawing length over actual length.
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