Question: 20. Determine the angle between a = (5, 3, 0) and b = ( -1, 0, 8) [3 Marks] 21. The vertices of a quadrilateral

20. Determine the angle between a = (5, 3, 0) and
b = ( -1, 0, 8) [3 Marks] 21. The vertices of

20. Determine the angle between a = (5, 3, 0) and b = ( -1, 0, 8) [3 Marks] 21. The vertices of a quadrilateral are A = [0, 3, 5], B = [-3, -1, 17], C = [4, -3, 15] & D = [7, 1, 3]. Prove that ABCD is a parallelogram. [5 Marks] x-1 y-2 Z+1 22. Determine the value of k for which the direction vectors of the lines k 2 k-1 - and x+3 -2 1' y = -1 are perpendicular. [4 Marks] 5

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