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    Hi guys, my answer to 1a is:

    \hat{n} = \frac{\vec{u} \times \vec{v}}{\sqrt{|\vec{u}| + |\vec{v}|}}

    d = \frac{\vec{a}.(\vec{u} \times \vec{v})}{\sqrt{|\vec{u}| + |\vec{v}|}}

    Is that correct?

    I'm not sure how to do 1b, would someone be able to explain it? Thanks.
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