Discussion
Three of the following are ways of finding the true length of a line inclined to both planes. The exception is
Answer: B
Correct answer: measuring the longer of the two projected lengths
Both projections of a line inclined to both planes are foreshortened, so the longer of them is still short of the truth and measuring it gives an underestimate. The other three are genuine methods: an auxiliary parallel to the line, the rotation method, and the trapezoidal construction on the plan and the height difference.
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