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A solid resting on an edge of its base has that edge

  • A.perpendicular to both principal planes
  • B.inclined to both principal planes
  • C.coincident with the axis of the solid
  • D.parallel to one principal plane and in the other

Answer: D

Correct answer: parallel to one principal plane and in the other

Resting on a base edge means that edge lies in the horizontal plane, and it is drawn parallel to the vertical plane so that it appears in true length in the elevation and the tilt can be measured. The base is then inclined to the horizontal plane, touching it along that line rather than over its whole area.

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