3.
\begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{032d2541-9905-4570-9584-9a144b02fde5-06_748_483_242_790}
\captionsetup{labelformat=empty}
\caption{Figure 1}
\end{figure}
Figure 1 shows a sketch of triangle \(P Q R\).
Given that
- \(\overrightarrow { P Q } = 2 \mathbf { i } - 3 \mathbf { j } + 4 \mathbf { k }\)
- \(\overrightarrow { P R } = 8 \mathbf { i } - 5 \mathbf { j } + 3 \mathbf { k }\)
- Find \(\overrightarrow { R Q }\)
- Find the size of angle \(P Q R\), in degrees, to three significant figures.