Mathematics 9709 · AS & A Level · Coordinate geometry

Coordinate geometry — practice question

With respect to the origin $O$, the position vectors for the points $A$, $B$ and $C$ are $\overrightarrow{OA} = \begin{pmatrix}2\\3\\5\end{pmatrix}$, $\overrightarrow{OB} = \begin{pmatrix}4\\2\\3\end{pmatrix}$ and $\overrightarrow{OC} = \begin{pmatrix}10\\0\\6\end{pmatrix}$.
(i)[6]

Find the angle $ABC$.

(ii)[2]

Given that $ABCD$ is a parallelogram, find the position vector of $D$.

Worked solution & mark scheme

This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: Applies the scalar product $\vec{BA}\cdot\vec{BC}$

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