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The concentric circles method draws an ellipse from

  • A.two circles on the major and minor axes as diameters
  • B.a single circle on the major axis as diameter
  • C.a rectangle circumscribing the whole ellipse
  • D.four arcs struck from four separate centres

Answer: A

Correct answer: two circles on the major and minor axes as diameters

Draw both circles about the common centre and a radius across them; the point where the vertical from the outer circle meets the horizontal from the inner lies on the ellipse. It is quick and exact, needing only a compass and a set square, and it gives as many points as radii are drawn.

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