Question: 3. Consider the triangle with vertices A(1,0, -1), B(3,-2,0) and C(1, 3, 3). (a) Find the angle at the vertex B. Express your answer

3. Consider the triangle with vertices A(1,0, -1), B(3,-2,0) and C(1, 3,

3. Consider the triangle with vertices A(1,0, -1), B(3,-2,0) and C(1, 3, 3). (a) Find the angle at the vertex B. Express your answer in terms of the arccosine function. Is this angle acute, obtuse, or right? (b) Find the area of the triangle ABC.

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