Discussion
A square of 40 mm side lying parallel to the horizontal plane has a plan of area
Answer: A
Correct answer: 1600 mm\( ^2 \)
A figure parallel to the plane of projection is not foreshortened, so the plan is the true shape at true size: \[ 40 \times 40 = 1600\ \mathrm{mm^2}. \] The plan of a horizontal figure can therefore be measured directly, which is why a drawing places faces parallel to a plane of projection wherever it can.
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