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A sphere's position cannot be deduced from its outline alone because the sphere has

  • A.a curved surface of variable radius
  • B.an axis inclined to both principal planes
  • C.no distinguishable orientation
  • D.no definite diameter

Answer: C

Correct answer: no distinguishable orientation

Because a sphere is identical about every axis through its centre, turning it changes nothing that a drawing can record: every view is the same circle. There is no axis, no base and no face to fix its attitude, so orientation is not a property it possesses. Its position, however, is definite and is given by the centre.

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