Plane and solid analytic geometry; an elementary textbook (1901)
Ashton, Charles H. (Charles Hamilton), 1866- · New York, C. Scribner's sons · leaf 72
Draw MN through P1 parallel to AB and continue the perpendicular Off to meet it at K. The equation of MN will be x cos u + y sin a — px = 0, where px may be either positive or negative. For, as thevalue of a is fixed and as MN can be any line parallel toAB, it may be on the opposite side of the…
Geometry, Analytic
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