Question: Consider the points: A(1,5,1), B(2,3,2) and C(2,2, 1). a. Determine whether the angle ABC is right, acute or obtuse. b. Find all unit vectors that

Consider the points: A(1,5,1), B(2,3,2) and C(2,2, 1). a. Determine whether the angle ABC is right, acute or obtuse. b. Find all unit vectors that are perpendicular to the plane that con- tains these three points. 0. Find the area of the triangle with these three points as its vertices

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