Analytic geometry for colleges, universities, and technical schools (1892)
Nichols, E. W. (Edward West), 1858- · Boston [Mass.] : Leach, Shewell & Sanborn · leaf 20
e positionof every point in a plane may be located. This method of locating a point is called the Polar System. CO-ORDINA TES. 5 The point 0 is called the Pole ; the line 0 X, the PolarAxis, or Initial Line; the distance r, the Radius Vector;the angle 6, the Directional or Vectorial Angle.… … FlG. 2. ured round to the left from the polar axis, and the oppositesign (—) to those measured to the right. The radius vector(r) is considered as positive (-j-) when measured from thepole toivard the extremity of the arc {&), and negative (—)when measured from the pole away from the extremity…
Geometry, Analytic
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