An elementary treatise on coordinate geometry of three dimensions (1912)
Bell, Robert J. T. (Robert John Tainsh), 1877-1963 · London : Macmillan and co., limited · leaf 27
1coincident with OX, and then turned through the givenangle </>, is the positive direction of ON. In the figure,u, <p, z are all positive. If the Cartesian coordinates of P are x, y, z, those of Nare x, y, 0. If we consider only points in the plane XOY,the Cartesian coordinates of N are x,… … 6. Polar coordinates. Suppose that the position of theplane OZPN, (fig. 2), has been determined by a given valueof <p, then we may define the positive direction of thenormal through O to the plane to be that which makes anangle 0 + 7r/2 with XOX. Our convention, (§ 4), then fixesthe positive…
Geometry, Analytic
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