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21. Vertices A(a, -6, 2), B(4, b, -9), C(3, 5, c), D(-2, -5, 11) form a parallelogram. a) Draw a simple diagram, and determine the

21. Vertices A(a, -6, 2), B(4, b, -9), C(3, 5, c), D(-2, -5, 11) form a parallelogram. a) Draw a simple diagram, and determine the values of a, b, and c. [3] b) Determine the exact area of triangle ABC. [3]

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