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v2 in r2 . 30. let r be the triangle with vertices at .x1; y1/, .x2; y2/, and .x3; y3/. show that farea of triangleg d 1 2 det 2 4 x1 y1 1 x2 y2 1 x3 y3 1 3 5 [hint: translate r to the origin by subtracting one of the vertices, and