Find the area of the shaded region in fig., if PQ=24 cm, PR=7 cm and O is the centre of the circle.

Let the circle have center O. PQ is a chord of length 24 cm, and PR is another chord of length 7 cm. We need more information to find the area of the shaded region. The provided information is insufficient to determine the area. We need either the radius of the circle, the angle subtended by the chord PQ at the center, or the position of point R relative to PQ and the circle. With more details about the geometry of the figure (like an image or further description) we could calculate the shaded area. For example, if we knew the radius of the circle, we could calculate the area of the circle and then potentially subtract the area of a sector and triangle to find the shaded area. But with only the lengths PQ and PR and the fact that O is the center, the shaded area is indeterminate.