Discussion
In the trapezoidal method the true length is found as the
Answer: B
Correct answer: hypotenuse of a triangle on the projected length
The trapezoidal method erects the height differences of the two ends perpendicular to the projected line and joins their tops. The projected length and the difference in height are the two perpendicular sides of a right triangle, and the true length is the hypotenuse - which is simply Pythagoras applied to the geometry of the projection.
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