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The line of intersection of the horizontal and vertical planes is called the

  • A.centre line of the projection
  • B.axis of the dihedral angle
  • C.trace of the auxiliary plane
  • D.reference line or ground line

Answer: D

Correct answer: reference line or ground line

The horizontal and vertical planes of projection intersect in a line, and when the planes are opened out into one sheet that line remains as the reference or ground line, usually marked XY. It is the datum from which heights are measured in the elevation and depths in the plan, so it links the two views.

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