Question: solve B13. The three points A, B and C are given by their coordinates A = (2, -1, 4), B = (1, 0, 2) and

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B13. The three points A, B and C are given by their coordinates A = (2, -1, 4), B = (1, 0, 2) and C = (2, -2, -4). (i) Calculate the area of the triangle ABC. [5 marks] (ii) A fourth point D has coordinates (7, 3, (). Determine / such that the vectors AB and CD are orthogonal. Check if, for this value of u, the two lines AB and CD intersect. [10 marks]

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