Let $\mathbf{a},$ $\mathbf{b},$ $\mathbf{c}$ be three vectors such that $\|\mathbf{a}\| = \frac{1}{\sqrt{2}},$ $\|\mathbf{b}\| = \frac{1}{\sqrt{3}},$ $\|\mathbf{c}\| = \frac{1}{\sqrt{6}},$ $\|\mathbf{a} + \mathbf{b} + \mathbf{c}\| = 1,$ and
\[\mathbf{a} = k (\mathbf{b} \times \mathbf{c})\]for some scalar $k.$  Find the angle between $\mathbf{b}$ and $\mathbf{c},$ in degrees.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Let $\mathbf{a},$ $\mathbf{b},$ $\mathbf{c}$ be three vectors such that $\|\mathbf{a}\| = \frac{1}{\sqrt{2}},$ $\|\mathbf{b}\| = \frac{1}{\sqrt{3}},$ $\|\mathbf{c}\| = \frac{1}{\sqrt{6}},$ $\|\mathbf{a} + \mathbf{b} + \mathbf{c}\| = 1,$ and
\[\mathbf{a} = k (\mathbf{b} \times \mathbf{c})\]for some scalar $k.$  Find the angle between $\mathbf{b}$ and $\mathbf{c},$ in degrees.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
90^\circ
Let $\mathbf{a},$ $\mathbf{b},$ $\mathbf{c}$ be three vectors such that $\|\mathbf{a}\| = \frac{1}{\sqrt{2}},$ $\|\mathbf{b}\| = \frac{1}{\sqrt{3}},$ $\|\mathbf{c}\| = \frac{1}{\sqrt{6}},$ $\|\mathbf{a} + \mathbf{b} + \mathbf{c}\| = 1,$ and
\[\mathbf{a} = k (\mathbf{b} \times \mathbf{c})\]for some scalar $k.$  Find the angle between $\mathbf{b}$ and $\mathbf{c},$ in degrees.
train