Problem 3. (a) Determine the cosine of the angles of the triangle whose vertices are A(1, –2, 1), B(3, 0, 2), C(0, 1, –3). (b) Determine whether the angle at the vertex A is obtuse or acute. Justify your answer.

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Problem 3. (a) Determine the cosine of the angles of the triangle whose vertices are
А(1, -2, 1), В(3, 0, 2), C (0, 1, —3).
(b) Determine whether the angle at the vertex A is obtuse or acute. Justify your answer.
Transcribed Image Text:Problem 3. (a) Determine the cosine of the angles of the triangle whose vertices are А(1, -2, 1), В(3, 0, 2), C (0, 1, —3). (b) Determine whether the angle at the vertex A is obtuse or acute. Justify your answer.
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