Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 148
ould be recognized asone of the principal lines of the plane (§ 99), parallel to H orV as the case may be. Thus, in Fig. 198, if Ah is given parallelto HQ, Av is parallel to GL; or if Av is given parallel to GL,then Ah is parallel to HQ. The line A in this case is a horizontal XIV, § 133] A LINE IX… … Fig. 198. Special Case II. Suppose that both the plane and thegiven projection of the line are parallel to the ground line.Whichever projection of the line is given, the other projectionwill also be parallel to the ground line. Let Q, Fig. 199, be thegiven plane, and suppose Ah to be given. One…
Geometry, Descriptive
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