Bailey, Frederick H. (Frederick Harold), 1865- · Boston, London, Ginn & Co. · leaf 81
int an infinite number of linescan be drawn. Therefore we should not expect to find anyequation. 35, Angle between Two Lines. I and II (Fig. 36) shall be two lines, making angles 0^ and O2respectively with XX, and f3 shall be one of the angles madeby them at their point of intersection. As we liave… … But tan ^1 = nrii and tan d^ = ma, where rrii and mj are therespective slopes of I and II. tan p mi — mal + mims [15] In applying this formula, the value of tan ^ may be foundto be negative. There are two cases in which this mayoccur: (1) As chosen, /8 may be an obtuse angle, when itstangent will…
Geometry, Analytic
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