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Figure 4.36
Special case. The given plane ∑ is parallel to the x (profile-projecting) (Fig. 4.37). The
required perpendicular from given point K is evidently a profile line, and may be drawn directly in
the profile projection as soon as the profile views of the given point and plane are obtained. In this
case it is not necessary to have the horizontal and frontal projections of the perpendicular in order to
know its actual length; these projections are, however, usually considered a part of the problem, and
are obtained by projecting from the profile view.
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