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TEST IX. 1 Let A (- 1, -5), B (3,-3), C (1,-3), D ( 5,-1). Calculate the vector 3 AB + 2CD. 2) Let A ( 2, 0 , 1 ) , B ( 4 , 1 , - 1 ), C ( 2 , 4, 4 ). Find the angle of the triangle with vertices A, B, C at the vertex C. 3) Find the area of the triangle with vertices A ( 2, 0, 1), B ( 4 , 1 , -1 ) , C ( 1 , - 1 , 3 ). 4) Where does the line through (- 1, -1, -1) and ( 1, 1, 1) intersect the plane given by x+ y - z = 2 ? 5 Find the parametric equation of the line of intersection of the planes given by 2 x + 4 + 32 = 6 and aty + 2 = 3