Discussion
For that same line the difference in height between its ends is
Answer: A
Correct answer: 35 mm
The difference in height is the vertical component of the line: \[ 70 \sin 30^\circ = 70 \times 0.5 = 35\ \mathrm{mm}. \] The plan length and the height difference are the two perpendicular sides of the right triangle whose hypotenuse is the true length, which is the whole basis of the trapezoidal construction.
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