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The two traces of a plane, produced if necessary, must meet

  • A.at a point equidistant from both planes
  • B.on the reference line
  • C.at right angles to one another
  • D.at the centre of the drawing sheet

Answer: B

Correct answer: on the reference line

The reference line is the intersection of the two planes of projection, so any point on it lies in both. A plane cutting both of them must contain the point where all three meet, and that point lies on the reference line - which is why the traces, produced if necessary, always meet there and never anywhere else.

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