Analytic geometry, for technical schools and colleges (1897)
Lambert, Preston Albert, 1862-1925 · New York, Macmillan · leaf 100
angle of 45 with2x-3i/ = G. Akt. 45.— Distance from a Point to a Line Write the equation of the given line in the normal formcccos« + ?/sin«-i:» = 0. Through the given point P{x, y)draw a line parallel to thegiven line. The normalequation of this xiarallelline is X cos a + y sill (t = AP. Since (x,… … 86 ANALYTIC GEOMETRY is x cos « + y sin « — p. The manner of obtaining this resultshows that the perpendicular FD is positive when the point Pand the origin of coordinates lie on different sides of the givenline; negative when the point P and the origin lie on the sameside of the given line. The…
Geometry, Analytic
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