Area of a kite-shaped region inside a circle

In the given figure, $P$, $Q$, and $R$ are three points on a circle of radius 10 cm with $O$ as its center, $\overline{PQ} = \overline{RQ}$, and $\angle PQR = 45\degree$. The figure is representative. The area of the shaded region $PQRO$ is ______________ cm$^2$.