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A solid resting on a corner of its base has its base

  • A.inclined to the horizontal plane
  • B.parallel to the horizontal plane
  • C.perpendicular to the vertical plane
  • D.coincident with the reference line

Answer: A

Correct answer: inclined to the horizontal plane

Resting on a corner means the base touches the horizontal plane at a single point, so the base cannot be lying flat - it must be inclined to the plane. The three resting positions form a sequence: on the base, and the base is parallel to the plane; on an edge, and it touches along a line; on a corner, and it touches at a point.

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