Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 112
entered on the detail of each operation withoutconfusing the main issue. VI, § 84] POINTS, LINES, AND PLANES 93 the point given and thepiercing point thusfound (§ 24). Second Method. An-other method is shownin Figs. 94 and 95.The point a and theplane Z being given,it is required to findthe distance… … in the line he. Now Itet Y berotated about FF*, into U, soas to show he and a in theiractual relations. This rotationis shown in Fig. 95. The pointh falls at ft, which is located inFig. 94 by making 6*6*equal to 6*6 and theangle c*6*6 equal to 90°.The point orotates to a*.The perpen-dicular a^d*can…
Geometry, Descriptive
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