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Mathematics 22 Online
OpenStudy (anonymous):

Suppose that the area of a parallelogram with vertices (0, 0, 0), (1, 0, 0), (6, 3, a) and (7, 3, a) is 13. Suppose also that the third vertex, (6, 3, a), makes an obtuse angle with the positive z-axis. What is the value of a ?

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