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What does a user coordinate system allow the draughtsman to do?

  • A.change the drawing units from metric to imperial and back
  • B.alter the scale at which the geometry is stored
  • C.restrict editing to a chosen layer of the drawing
  • D.set a convenient origin and orientation for the work in hand

Answer: D

Aligning the axes with an inclined face lets coordinates be entered as though that face were orthogonal, which removes a great deal of trigonometry. The world coordinate system remains beneath it as the fixed reference for the whole model.

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