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A cylinder resting on its base with its axis vertical appears in the plan as

  • A.a circle
  • B.a rectangle
  • C.a straight line
  • D.an ellipse

Answer: A

Correct answer: a circle

Looking down on a cylinder standing on its base, every generator projects into the base circle and the axis into its centre, so the plan is simply a circle of the true base diameter. The elevation would be a rectangle of the base diameter by the axis length - the two views together identifying the solid unambiguously.

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