Woods, Frederick S. (Frederick Shenstone), 1864-, Bailey, Frederick H. (Frederick Harold), 1865- · Boston, New York [etc.] Ginn and Company · leaf 140
an angle of 3»>0° and laying offDl=b, always in the direction of the terminal line of AOD. Let P be (>•, 0), where 6 = AOD. Then r = OD+DP when6 is in the first or the fourth quadrant, and r=— (>I) + DPwhen 6 is in the* second or the thirdquadrant. But it appears from thefigure that OD =… … Fn;. 109 In studying the shape of thecurve there are three cases to bedistinguished: 1. b>a. r is always positive; the curve appears as in fig. 108. 2. b < a. r is positive when cos 6 > •> negative when h 1 ^ c,osd< , and zero when cos 0 = The curve appears as a a in fig. 109. 3. b =…
Geometry, Analytic · Calculus
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