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A point 30 mm below the horizontal plane and 20 mm behind the vertical plane lies in the

  • A.first quadrant
  • B.second quadrant
  • C.fourth quadrant
  • D.third quadrant

Answer: D

Correct answer: third quadrant

The quadrants are defined by the two planes: first is above and in front, second above and behind, third below and behind, fourth below and in front. Below the horizontal plane and behind the vertical is therefore the third quadrant, in which the plan appears above the reference line and the elevation below it.

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