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The elements of plane analytic geometry. A text-book including numerous examples and applications, and especially designed for beginners (1903)
Briggs, George R. (George Russell), b. 1853, Bôcher, Maxime, 1867-1918 · New York, J. Wiley & sons; [etc., etc.] · leaf 65
\ + ^2 ->^3 - ^3 y-1 … (0 p p - V(/2 - is) + (^2 - ^3) (2) 58 ANALYTIC GEOMETRY. By § 10, we have p, p, = VO; -y^ + {X, - x,y (3) If A represents the area of the triangle, = (J2 -y^^ ^1 - (-^2 - ^3) yi + ^2^3 - ^3 J2 • • • • (4) Equation (4) may be written 2 ^ = (^1 - X,) 7, + (at, - ^3) y^ + {x^ - x^ y^. This form is…Geometry, Analytic -- Plane
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