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Match the line's position with where its true length appears.

1. Parallel to both planes   2. Parallel to the vertical plane only   3. Inclined to both planes

P. In the elevation only   Q. In both views   R. In neither view

  • A.1-Q, 2-P, 3-R
  • B.1-P, 2-Q, 3-R
  • C.1-Q, 2-R, 3-P
  • D.1-R, 2-P, 3-Q

Answer: A

Correct answer: 1-Q, 2-P, 3-R

Foreshortening occurs in any view whose plane is not parallel to the line. A line parallel to both planes is parallel to each, so both views give the true length. One parallel to the vertical plane only gives it in the elevation. And one inclined to both is parallel to neither, so neither view gives it and an auxiliary is required.

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