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A sphere appears in every orthographic view as

  • A.a straight line in one view
  • B.a circle of the same diameter
  • C.an ellipse of varying eccentricity
  • D.a circle of diameter depending on the view

Answer: B

Correct answer: a circle of the same diameter

A sphere looks the same from every direction, so each orthographic view is a circle of the sphere’s own diameter, whatever the direction of viewing. It is the only common solid for which this is true, and it is why a sphere on a drawing must be located by centre lines rather than identified by its outline.

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