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B. Inclined Lines

Lines that appear true length in the frontal or profile view (but
not both) are inclined

Figure 7.6 Inclined lines

Lines. Inclined lines will be parallel to the frontal plane, or
parallel to the profile plane. Hence, inclined lines will appear
foreshortened in two principal views and true length in the
other principal view. In example (1), line 1-2 is true length in
the frontal view i.e. parallel to the frontal projection plane and
foreshortened in the H (T) and P (S) views. In example (2),
line1-2 is true length in the profile view i.e. parallel to the
profile projection plane and foreshortened in the H and F
views. Note that line1-2 in example (1) is the same distance
behind the frontal plane in both the horizontal and profile view,
dimension D1.