Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 154
icular to V (§ 134). Thenthe angle between VR and GL isthe angle a, which Q makes with H.Similarly, by revolving about theaxis B, lying in H and perpendicularto V, we obtain the angle (3, which Qmakes with V. It will be seen in Fig. 209 that thetraces HR and VS, perpendicular toGL, are not… … Fig. 209.
Geometry, Descriptive
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