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4.11.1 Vectors (A-level only)

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Question 6

The points A A\,A and B B\,B have position vectors (2 1 −3)\begin{pmatrix} 2 \ 1 \ -3 \end{pmatrix}(2 1 −3​) and (5 −1 0)\begin{pmatrix} 5 \ -1 \ 0 \end{pmatrix}(5 −1 0​) respectively.

a.

Find the exact length of ABABAB.

[2]
b.

Find the position vector of the midpoint of ABABAB.

[1]
c.

The points P P\,P and Q Q\,Q have position vectors (4 2 1)\begin{pmatrix} 4 \ 2 \ 1 \end{pmatrix}(4 2 1​) and (1 4 −2)\begin{pmatrix} 1 \ 4 \ -2 \end{pmatrix}(1 4 −2​) respectively. Show that ABPQ ABPQ\,ABPQ is a parallelogram.

[3]

4.11.1 Vectors (A-level only) Questions

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