Dowling, L. Wayland (Linnaeus Wayland), b. 1867, Turneaure, F. E. (Frederick Eugene), 1866- · New York, H. Holt and company · leaf 39
ther case tan ^9 — tan 6, tan </) = tan (^2 — ^1) = 1 + tan 62 tan 9i (2) (3) If mj and mj are respectively theslopes of Q1Q2 and P1P2, formula (3)becomes »W2 — vrix tan ^ — 1 -I- mi,fn\ (4) As an example of the use of formula(4), we will find the angle which the seg-ment joining (3,5) to (— 2,… … Fig. If) Arts. 14, 15] PARALLEL SEGMENTS 23 14. Parallel segments. Parallel segments either have equalinclinations, as at (a) (Fig. 16), or else their inclinations diiferby 180° as at (&). In either case, their slopes are the same Y P, ->.Y
Geometry, Analytic
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