Quick questions on Vectors: the scalar product and angles in three dimensions - SQA Higher Maths

2short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is q1?

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Find the magnitude of

\begin{pmatrix} 2 \\ -3 \\ 6 \end{pmatrix}

. [2 marks]

What is q2?

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Show that

\begin{pmatrix} 1 \\ 2 \\ -1 \end{pmatrix}

and

\begin{pmatrix} 3 \\ -1 \\ 1 \end{pmatrix}

are perpendicular. [2 marks]

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