D1.4. The three vertices of a triangle are located at A(6, -1, 2), B(-2, 3, -4), and C(-3, 1, 5). Find: (a) RAB × RAC; (b) the area of the triangle; (c) a unit vector perpendicular to the plane in which the triangle is located. Ans. 24ax +78ay + 20az; 42.0; 0.286ax +0.928ay +0.238az
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