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What distinguishes isometric from dimetric and trimetric projection?

  • A.all three axes are equally inclined to the plane of projection
  • B.two of the three axes are equally inclined to the plane
  • C.none of the three axes is inclined to the plane
  • D.the three axes lie in a single plane together

Answer: A

Equal inclination means all three principal directions foreshorten by the same ratio, so one scale serves for every axis. Dimetric has two equal and trimetric three unequal ratios, which is why isometric is by far the commonest of the three in practice.

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