Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 113
onsiderations furnish thebasis for the following solution. Referring to Fig. 96, the common perpendicular between ab and cdbeing required : (1) Pass the plane Z through ab and parallel toerf (§ 72). The line ef, parallel to cd and intersecting ab at anypoint, as g, was used as an auxiliary line.… … Fio. 96 VI, § 87] rOINTS, LINES, AND PLANES 95 the projection of cd on Z is obtained. This line contains thefoot of every perpendicular dropped from cd on Z. (4) • Thepoint where jk crosses ah, namely, m, will be the foot of thexiommon perpendicular between cd and ah. (5) Draw mnparallel to cj, and…
Geometry, Descriptive
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