Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 38
V projectionis equal in length to the given lineah, and that the length of the Hprojection is less than the lengthof the line. Moreover, the angle 6is equal to the angle i^. Nowimagine the line ah to be rotated inthe plane aabh, using a as a center.During the rotation, the length ofthe V… … 22 DESCRIPTIVE GEOMETRY [HI, § 17 Figure 19 shows a line which is inclined to both planes ofprojection. It will be evident immediately that the projectionsare each shorter than the line itself, and that the angles a and/S* between the projections and HA are greater than the angles
Geometry, Descriptive
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
