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What does the four-centre method produce when applied to an isometric circle?

  • A.an approximate ellipse built from four arcs
  • B.a true ellipse accurate at every point of its outline
  • C.a circle of the correct foreshortened diameter
  • D.a rhombus with its corners rounded off

Answer: A

Two arcs of large radius and two of small are struck from the corners and the diagonal intersections of the enclosing rhombus. Being circular arcs it is not a true ellipse and departs slightly near the ends of the axes, which is accepted for the speed it offers.

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