Schmall, Charles Nelson. [from old catalog] · New York, D. Van Nostrand company · leaf 83
Fig. 74. Let P (x, y) be any point on the line.PD sin 0 Then, or, CD sin (<o - ^) ■X — x^ sin (co — 6) 66 ANALYTICAL GEOMETRY 39. Equation of a line in terms of the _L on it from theorigin and the angles which this ± makes with the axes. The equation of AB is I … 1- -^ = 1. OA ^ OB But OA V 0B = cos aV COS y8 ^^ ^^- where ^ = OP. .*. X cos a.-\- y COS P = p is the required equation. 40. Polar Co-ordinates. Equation of the straight linethrough two points (p^ 6^ and (/Og, 6^.
Geometry, Analytic
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