1. The diagram shows two circles such that the region $R$, shown shaded in the diagram, is the region common to both circles.

One of the circles has centre $O$ and radius 5cm.
The other circle has centre $P$ and radius 4 cm.
Angle $AOB=50^{\circ}$

Calculate the area of region $R$.
Give your answer correct to 3 significant figures.

...................................................... cm²