Bailey, Frederick H. (Frederick Harold), 1865- · Boston, London, Ginn & Co. · leaf 31
problems, and to follow thesame methods in solving similar numerical problems, rather than tomemorize them and substitute numerical values for ri, x^, etc. (1) 10. Relation between Cartesian and Polar Coordinates. As the position of the same point may be determinedeither by x and y or by r and 6,… … Fig. 13. THE POINT. 17 If the rectangular coordinates of P (r, 0) are x and y, byTrigonometry, X = r cos 0,y = r sin 9- From [7], we may derive the formulas [7J r = Vx- + y-, e-tan-^- ^^^ X Ex. 1. Find the rectangular coordinates of P(o, 30°); by [7], 3V3X = 3 cos 30° = ——, y = 3 sin 30° = - ■ Ex.…
Geometry, Analytic
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