Discussion
A CAD drawing hatches incorrectly and reports an area of zero for a closed-looking outline. The likely cause is
Answer: B
Correct answer: a gap between two entities at a corner
Hatching and area measurement both need a genuinely closed boundary, and an outline that merely looks closed at screen resolution may have a gap of a fraction of a unit at a corner. Zooming in on each corner, or using the drawing’s own boundary check, finds it - and snapping to endpoints in the first place prevents it.
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