Discussion
A line drawn 20 cm long now measures 19.5 cm. The shrinkage factor is
Answer: C
Correct answer: 0.975
The shrinkage factor is the ratio of the present length to the original: \[ \frac{19.5}{20} = 0.975. \] It is less than one because the sheet has contracted, and being a ratio of two lengths it is dimensionless and can be applied directly to any other length on the same sheet.
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