Dot Product and Angle

Problem: For \(\mathbf{A} = \{2\,\mathbf{i} - 3\,\mathbf{j} + 6\,\mathbf{k}\}\) and \(\mathbf{B} = \{4\,\mathbf{i} + 2\,\mathbf{j} - \mathbf{k}\}\), find \(\mathbf{A}\cdot\mathbf{B}\) and the angle between the two vectors.