Descriptive geometry . n in which thegiven plane iVis parallel to GL, which neces-sitates the use of an auxiliary profile the given point b pass the profileplane P. Determine b^ and PA^, and throughb^ draw PjS^ the profile trace of the requiredplane, parallel to PiV, whence Fas and HjS^ thetraces of the required plane, are determined. This condition may also be solved, Fig. 119,by passing a line A through the given pointb, parallel to ani/ line C of the given planeJST. Through the traces of line A the tracesof the required plane S are drawn parallel toffiVand VN^ respectively. Th
Descriptive geometry . n in which thegiven plane iVis parallel to GL, which neces-sitates the use of an auxiliary profile the given point b pass the profileplane P. Determine b^ and PA^, and throughb^ draw PjS^ the profile trace of the requiredplane, parallel to PiV, whence Fas and HjS^ thetraces of the required plane, are determined. This condition may also be solved, Fig. 119,by passing a line A through the given pointb, parallel to ani/ line C of the given planeJST. Through the traces of line A the tracesof the required plane S are drawn parallel toffiVand VN^ respectively. This method is applicable to all conditionsof Case 1. 77. Case 2.* To pass a plane through agiven point perpendicular to a given line. Fig. 120 illustrates a condition in which theprojections of the given line are perpendicularto GrL; hence, the traces of the required planewill be parallel to GrL. Let ac be the given * The numbers of the cases are the same as those inArt. 70, page 50. RELATION BETWEEN LINES AND PLANES 53. vs /I VN y^ ! ^i 1 1 /1 0/ \/ HN y HS Fig. I 19.
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