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How does a circle lying in an isometric plane appear?

  • A.as a parabola open toward the nearest axis
  • B.as a straight line of the diameter's length
  • C.as an ellipse
  • D.as a circle of reduced diameter

Answer: C

One diameter of the circle lies along an isometric line and foreshortens with it while the perpendicular diameter foreshortens differently, which is exactly the condition for an ellipse. It is why isometric drawings of holes and shafts are set out as ellipses throughout.

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