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At what angle to the horizontal are the two sloping isometric axes conventionally drawn?

  • A.60 degrees
  • B.15 degrees
  • C.30 degrees
  • D.45 degrees

Answer: C

The two sloping axes are drawn at \( 30^{\circ} \) to the horizontal. That leaves the third axis vertical and separates the three by \[ 30^{\circ} + 90^{\circ} = 120^{\circ} \] which is the defining symmetry of isometric projection. It is also convenient in practice, since a thirty-sixty set square draws them directly without a protractor.

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