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Figure 4.17
In general, through a given point of a plane one horizontal and one frontal line can be drawn.
Steepest line (lines of maximum inclination)
The lines of a plane which have the greatest inclination to the plane of projection name lines
of maximum inclination or maximum slope line.
Lines of maximum inclination to the horizontal plane of projections Π 1 are perpendicular to
the horizontal lines of the plane (Fig. 4.18).
Lines of maximum inclination

Figure 4.18

4.6 PARALLEL RELATION BETWEEN LINES AND PLANES

A line is parallel to a plane if it is parallel to some line in the plane. Converse, a plane is
parallel to a line if the plane contains a line parallel to the given line (Fig. 4.19).

Figure 4.19

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