Descriptive geometry . Fig. 76. Fig. Fig. 71 30 DESCRIPTIVE GEOMETRY 42. Given a point lying on a plane, todetermine its position when the plane shallhave been revolved about either of its tracesas an axis to coincide with a coordinate plane. Principle. This is identical with the prin-ciple of Art. 38, page 25, since either trace ofthe plane is an axis lying in a coordinate plane,one projection of which is the line itself, andthe other projection of which is in the groundline. Method. See Art. 38, page 25. Construction. Fig. 79. ffiVandFiVarethe traces of the given plane and 5 and 5% thep
Descriptive geometry . Fig. 76. Fig. Fig. 71 30 DESCRIPTIVE GEOMETRY 42. Given a point lying on a plane, todetermine its position when the plane shallhave been revolved about either of its tracesas an axis to coincide with a coordinate plane. Principle. This is identical with the prin-ciple of Art. 38, page 25, since either trace ofthe plane is an axis lying in a coordinate plane,one projection of which is the line itself, andthe other projection of which is in the groundline. Method. See Art. 38, page 25. Construction. Fig. 79. ffiVandFiVarethe traces of the given plane and 5 and 5% theprojections of the point. If the plane withpoint h thereon be revolved into H about HNas an axis, the point will move in a plane per-pendicular to ffiV, and will lie somewhere inh%. Its position in this line must be deter-mined by finding the true distance of the pointfrom HN^. This distance will equal the hy-potenuse of a right triangle of which h^d^the horizontal projection of the hypotenuse,is one leg, and h^c^ the distance of the poin
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