Dowling, L. Wayland (Linnaeus Wayland), b. 1867, Turneaure, F. E. (Frederick Eugene), 1866- · New York, H. Holt and company · leaf 31
Fig. 8 14 SYSTEMS OF COORDINATES [Chap. I. through the given angle $ about 0 into the position OX. OnOX mark the point which represents the given number r. Thereis but one such point. Por example, the point P(-~ 5, — 30°) isobtained by rotating OX through the angle — 30° and markingthe point 5… … Fig. 9 On the other hand, a given point has many sets of polar coor-dinates. For example, the point P in Fig. 9 is (—5, —30°),(5, 150°), (-5, 330°), (5, -210°), etc. It is always possible,however, and usually most convenient, to choose the polar coor-dinates of a point so that the radius vector…
Geometry, Analytic
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