Edexcel F2 2018 June — Question 8

Exam BoardEdexcel
ModuleF2 (Further Pure Mathematics 2)
Year2018
SessionJune
TopicPolar coordinates

8. \begin{figure}[h]
\includegraphics[alt={},max width=\textwidth]{27ac35ba-1969-4a37-a7c5-f4741c9c59a8-28_570_728_264_609} \captionsetup{labelformat=empty} \caption{Figure 1}
\end{figure} Figure 1 shows a sketch of the curves with polar equations $$\begin{array} { l l } r = 2 \sin \theta & 0 \leqslant \theta \leqslant \pi
r = 1.5 - \sin \theta & 0 \leqslant \theta \leqslant 2 \pi \end{array}$$ The curves intersect at the points \(P\) and \(Q\).
  1. Find the polar coordinates of the point \(P\) and the polar coordinates of the point \(Q\). The region \(R\), shown shaded in Figure 1, is enclosed by the two curves.
  2. Find the exact area of \(R\), giving your answer in the form \(p \pi + q \sqrt { 3 }\), where \(p\) and \(q\) are rational numbers to be found.