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What distinguishes the true shape of a section from its apparent shape in a principal view?

  • A.the true shape is seen only on a plane parallel to the section plane
  • B.the true shape is always seen in the plan of the cut solid
  • C.the true shape is always seen in the elevation of the cut solid
  • D.the two are identical whenever the section plane is inclined

Answer: A

A section plane inclined to a principal plane is seen obliquely in that view, so the cut appears foreshortened there. Projecting onto a plane parallel to the section plane, which means perpendicular to the direction of view along it, restores the figure to its true size and shape.

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