Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 40
equal in length to the given lineab, and that the length of the Hprojection is less than the lengthof the line. Moreover, the angle 0is equal to the angle ^. Nowimagine the line ah to be rotated inthe plane aa^h^h, using a as a center.During the rotation, the length ofthe V projection, at, will… … FiQ. 18 22 DESCRIPTIVE GEOMETRY [in, § 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/3* between the projections and HA are greater than the angles
Geometry, Descriptive
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