Descriptive geometry . 18 DESCRIPTIVE GEOMETRY 25. Case 2. When the line is inclined toV and H and is parallel to P. CoNSTEUCTiON. Fig. :. If the given lineis parallel to P, its vertical and horizontaltraces cannot be determined by the abovemethod, since the projections of the line areperpendicular to the ground line; hence, aprofile projection of the line is necessary.

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