Descriptive geometry . beeffected by using an auxiliary line parallel to V; such a linewould be a vertical principal line of Q. Special Case. The general method fails when the givenline is a profile line. Let ab, Fig. 102, be the given line, andc the given point. The required plane Q will be parallel tothe ground line, hence perpendicular to P. Find the profileprojection of the line ab and the point c. Through c drawthe edge view and profile trace, PQ, of Q, perpendicular toapbp. From PQ find J/Q and VQ. 96 DESCRIPTIVE GEOMETRY [XI, § 115 Problem 11. To find the plane which contains a given li
Descriptive geometry . beeffected by using an auxiliary line parallel to V; such a linewould be a vertical principal line of Q. Special Case. The general method fails when the givenline is a profile line. Let ab, Fig. 102, be the given line, andc the given point. The required plane Q will be parallel tothe ground line, hence perpendicular to P. Find the profileprojection of the line ab and the point c. Through c drawthe edge view and profile trace, PQ, of Q, perpendicular toapbp. From PQ find J/Q and VQ. 96 DESCRIPTIVE GEOMETRY [XI, § 115 Problem 11. To find the plane which contains a given line and isperpendicular to a given plane. Analysis. Through any point of the given line draw anauxiliary line perpendicular to the given plane. Any planecontaining this line will be perpendicular to the given plane(§ 113). Hence the required plane is the plane determinedby the given and auxiliary lines. Construction (Fig. 163). Let A be the given line and Q thegiven plane. Assume any point c on the line A, and through.
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