Descriptive geometry . Fig. 226. Fig. 227. In Fig. 227, the given plane Q is parallel to the ground general case still applies, but there is an extra detail inthe construction. As before, assume any point c in the line c drop the perpendicular B to the plane Q. Find theangle, S, between the lines A and B. Then y, the complementof 8, is the angle required. As a necessary step in finding theangle S, we need one trace, as VX, of the plane containing thelines A and B. To determine VX we need the F-trace of eachof these lines. The F-trace of A is readily found (Prob. 1,§37). But B i
Descriptive geometry . Fig. 226. Fig. 227. In Fig. 227, the given plane Q is parallel to the ground general case still applies, but there is an extra detail inthe construction. As before, assume any point c in the line c drop the perpendicular B to the plane Q. Find theangle, S, between the lines A and B. Then y, the complementof 8, is the angle required. As a necessary step in finding theangle S, we need one trace, as VX, of the plane containing thelines A and B. To determine VX we need the F-trace of eachof these lines. The F-trace of A is readily found (Prob. 1,§37). But B is a profile line, of which hut one point, c, isknown. Nevertheless, the line B is a definite line, since it isperpendicular to Q. To find the F-trace of B, proceed as fol-lows: Find the profile projection, c,p, of c; also the profiletrace, PQ, of Q. From <• draw the profile projection of B, Bpperpendicular to PQ. Then the F-trace of B is the point t2,in which B intersects VP. (See Prob. 11, Special Case 2, § 115
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