Tough or trick

Two circles $p$ and $q$ which have the same radii of 7 cm intersect to each other and the distance between their centre, $pq = 11 \text{ cm}$ .

$ab$ is a tangent line that touches the circle $p$ and $q$ at points $a$ and $b$ respectively.

Find the area of the shaded region ( in $\text{cm}^2$ ).

Use the approximation, $\pi = \dfrac{22}7$ .