Dowling, L. Wayland (Linnaeus Wayland), b. 1867, Turneaure, F. E. (Frederick Eugene), 1866- · New York, H. Holt and company · leaf 136
PTN\^ such a triangle,where FT is the tan-gent at P, PN is thenormal at P, and TNis the X-axis. PT is called the tangent length and PN the normal length. DP is theordinate of P, PT is the projection of PT on the X-axis and iscalled the subtangent, 1)1^ is the projection of PiVon the X-axisand is… … Fig. 72 120 LOCI OF SECOND ORDER [Chap. VII. Z>r=|2/iC0tc/>I, where the bars indicate positive, or absolute, value. EXERCISES 1. Write the equation of the normal to the circle at the point (a:i, yi).Note that the normal passes through the center of the circle. 2. Write the eqiiation of the…
Geometry, Analytic
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