Discussion
Comparing the rotation with the trapezoidal method for true length, the trapezoidal method
Answer: C
Correct answer: works from the projected length and the height difference
The trapezoidal method takes what the views already give - the length in plan and the difference in height between the ends - and treats them as the two perpendicular sides of a right triangle whose hypotenuse is the true length. Nothing is swung or reprojected, which is why it is the quicker of the two constructions.
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