In a circle with radius $14\,cm , \overline{ OA }$ and $\overline{ OB }$ are radii perpendicular to each other. Then, the area of the minor sector corresponding to $\angle AOB$ is $\ldots \ldots \ldots . cm ^{2}$.

As shown in the adjoining diagram, the length of the square plot ABCD is $50 m .$ At each vertex of the plot, a flower bed in the shape of a sector with radius $10 \,m$ is prepared. Find the area of the plot excluding the flower beds. $(\pi=3.14)$ (in $m^2$)

In $\odot( O , 6), \widehat{ ABC }$ is a major arc and $m \angle AOC =60 .$ Then, the length of major $\widehat{ ABC }$ is ...........

Three circles each of radius $3.5\, cm$ are drawn in such a way that each of them touches the other two. Find the area enclosed between these circles. (in $cm ^{2}$)

In a circle with radius $21 \,cm$, the length of a minor arc is $33 \,cm .$ Find the measure of the angle subtended at the centre by this arc. Also find the area of the minor sector and the minor segment formed by it.

The radit of two concentric circles are $23\, cm$ and $16 \,cm .$ Find the area of the circular ring formed by the circles. (in $cm^2$)