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8. Calculate the area of the parallelogram whose adjacent sides are: a = [6, 3, -2] and b = [1, 3, -1] [4] 9. The points A[-1, 1, 1], B[2, 0, 3], and C[3, 3, -4]. Show that this triangle is a right-angle triangle. [3] 10. Determine the following: a) Determine the vector equation of the plane that contains the following two lines L1:r = (2,3, -5) + t(3, 1,5), tER [2] 12: 1 = (2,3, -5) + s(0, 4, -3), SER b) Determine the corresponding Cartesian equation. [5]