Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 178
. The line no (nhoh, uvov) is the required common perpendicular.The shortest distance between the given lines is equal to thetrue length of no (Prob. 3, § 80). Special Case I. One of the given lines is parallel to H orV. The general solution will apply to this case ; but a partic-ular solution,… … Fig. 238. dicular to Ah. Project the given lines A and B on the second-ary vertical plane Vx thus assumed (§ 68). The line A willproject as a point, Axv. The required line no is perpendicularto both A and B. Since A is perpendicular to Vx, no, which isperpendicular to A, is parallel to Vx. Again,…
Geometry, Descriptive
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