Plane and solid analytic geometry; an elementary textbook (1905)
Ashton, Charles H. (Charles Hamilton), 1866- · New York, C. Scribner's Sons · leaf 67
rpendicular to OH.,is drawn, that line is com-pletely determined. Itis convenient to restrict a to positive values from 0° to360°. In case we wish to speak of a complete set of parallellines without changing «, it will be necessary to allow p tobe either positive or negative, but every line in the… … of its intercepts is - + ^ = 1.line P - = cos «, or P cos a and y^=sina, or b =-J-— 0 sm a Substituting these values of a and 5, tlie equation of AB becomes a? cos a + 2/sin a = 2>. [lo] Ch. IV, § 35] THE STRAIGHT LINE 51 This is called the normal form of the equation of astraight line. Let the…
Geometry, Analytic
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