Question: Point A(4, 2, 5) and the two vectors, R AM = (20, 18 10) and R AN = (10, 8, 15), define a triangle.

Point A(−4, 2, 5) and the two vectors, RAM = (20, 18 − 10) and RAN = (−10, 8, 15), define a triangle. Find

(a) A unit vector perpendicular to the triangle;

(b) A unit vector in the plane of the triangle and perpendicular to RAN;

(c) A unit vector in the plane of the triangle that bisects the interior angle at A.

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