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On which line does the major axis of an isometric ellipse lie?

  • A.along the shorter diagonal of the enclosing rhombus
  • B.parallel to the nearest isometric axis
  • C.vertically
  • D.along the longer diagonal of the enclosing isometric rhombus

Answer: D

The rhombus that encloses the circle has unequal diagonals, and the ellipse touches the midpoints of its sides with its major axis along the longer one. Getting the two diagonals the wrong way round produces an ellipse visibly tilted against the face it should lie in.

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