Dowling, L. Wayland (Linnaeus Wayland), b. 1867, Turneaure, F. E. (Frederick Eugene), 1866- · New York, H. Holt and company · leaf 25
ween the two directions in which a seg-ment may be laid off on a given straightline. This is done by calling one direction positive and the other negative. Thus, if ^ Fig. 2 4. n we agree to call the direction from A to B (Fig. 2) posi-tive, then we shall call the direction fromjB to -4 negative.… … Arts. 2,3] DIRECTED SEGMENTS, DIRECTED ANGLES 9 shown in Fig. 3 can be described by a line rotating with thehands of a clock, or clockwise, from OB to OA; or counterclockwise,from OA to OB. It is customary to consider counterclockwiserotation as positive, and clockwise rotation as negative. Thus,…
Geometry, Analytic
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