Ames, William L. (William Lewis), 1855-, Wischmeyer, Carl · New York, McGraw-Hill book company, inc.; [etc., etc.] · leaf 72
truelength of C is simplified bydrawing C parallel to H orV. In the figure it isdrawn parallel to V, there-fore C shows true length.Find the true lengths ofA and B, construct thetriangle with the three true lengths as sides, and the angle between A and B is therequired angle a. Problem 46.—ro find… … Fig. 122. 62 DESCRIPTIVE GEOMETRY these lines, which may be found by the methods of Problem45, is the angle required. Second Method.—From any point in space draw two lines,one perpendicular to each plane. The angle between theselines, which may be found by the methods of Problem 45, isthe…
Geometry, Descriptive
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