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An auxiliary view is needed for the true shape in all but one of these cases. Which one?

  • A.a hexagonal prism cut obliquely across all six faces
  • B.a cylinder cut perpendicular to its axis
  • C.a square prism cut at forty-five degrees to its base
  • D.a cone cut parallel to one of its generators

Answer: B

Correct answer: a cylinder cut perpendicular to its axis

A cut perpendicular to a vertical axis is horizontal, and the plan is already a view of a horizontal plane, so the section appears there at true size with no further projection. Each of the other three cuts is inclined to both principal planes and is foreshortened in each, so an auxiliary view is required.

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