Question: The points A, B and C have coordinates (1, 1, 2), (9, 0, 8) and (5, 0, 5) relative to rectangular cartesian axes. Find (a)

The points A, B and C have coordinates (1, –1, 2), (9, 0, 8) and (5, 0, 5) relative to rectangular cartesian axes. Find

(a) The vectors AB(vector) and AC(vector);

(b) A unit vector perpendicular to the triangle ABC;

(c) The area of the triangle ABC.

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