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A plane containing a given line must have its traces passing through

  • A.the midpoint of the line's plan
  • B.the reference line at right angles
  • C.the ends of the line in both views
  • D.the traces of that line

Answer: D

Correct answer: the traces of that line

A trace of the line is a point where the line meets a plane of projection, and if the line lies in the plane then that point lies in the plane too, and hence on the plane’s trace. So the plane’s horizontal trace passes through the line’s horizontal trace and its vertical trace through the line’s vertical trace - which is how such a plane is constructed.

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