Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 181
160 DESCRIPTIVE GEOMETRY [XVI, § 145 respectively. Draw crs2 and crs3. The angle between theselines equals the required angle, 6, between the given planes. Additional examples are given in Figs. 242 and 243. Eachof them falls under the general case, but they differ in themethod of finding the line… … R is in quadrants I and 3,30° with H Fig. 242. Fig. 243. obtained by means of the auxiliary plane X (Prob. 12, SpecialCase 5, § 118). The secondary projection Ax passes throughs1 and the secondary projection of b. Figure 243 is similar to Figure 242 in that the traces HQ, HR,VQ, and VR intersect in…
Geometry, Descriptive
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