(a) Let P(3,0, 2), Q(8,1, -1) and R (4,3,0) be vertices of a triangle. Use cross...

 

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(a) Let P(3,0, 2), Q(8,1, -1) and R (4,3,0) be vertices of a triangle. Use cross product concept to find the angle between PQ and QR. (b) Find a unit vector perpendicular to the plane through A(2, 1,-1), B(-1,1, 2) and С 1, -1, 2). (a) Let P(3,0, 2), Q(8,1, -1) and R (4,3,0) be vertices of a triangle. Use cross product concept to find the angle between PQ and QR. (b) Find a unit vector perpendicular to the plane through A(2, 1,-1), B(-1,1, 2) and С 1, -1, 2).