Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 126
Fig. 179. Fig. 180. (Prob. 13, § 119); in the figure, this is done by using the aux-iliary plane X, perpendicular to II. Then ahbh and avbv are theprojections of the required shortest distance, the true lengthof which may be found by Problem 3 (§ 78 or § 80). Special Case i Fig. 180). The given…
Geometry, Descriptive
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