Analytic geometry and principles of algebra (1913)
Ziwet, Alexander, 1853-1928, Hopkins, Louis Allen, joint author, Hedrick, E. R. (Earle Raymond), 1876-1943 · New York, The Macmillan Company · leaf 26
+ ^2(./3 - //i) + Xs(y, - ?/.,)]. For numerical computation it is best to put down the coordi-nates of the three points with a 1 after each pair, thus: i, § 14] COORDIXATES 13 ^1 Vi 1x-> y-> 1 Then add the three products formed by following the full linesand subtract the three products formed… … xo y.2 ^3 ys Here as in § 12 the sign of the area is + or — according asthe sense of the motion along the perimeter PiPoP^Pi is coun-terclockwise or clockwise. EXERCISES 1. Find the areas of the triangles having the following vertices : («) (1,3), (5,2), (4,6); (b) (-2, 1), (2, -3), (0, - 6) ; (c)…
Geometry, Analytic
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