From a circular metallic sheet with radius $21\, cm ,$ a regular hexagon of side $21\, cm$ is cut off. Find the area of the remaining sheet. $(\sqrt{3}=1.73)$ (in $cm^2$)

The radius of a semicircular garden is $35\,m$. One has to walk $\ldots \ldots \ldots \ldots m$ to make one complete round of that garden.

The area of the circle that can be inscribed in a square of side $6 \,cm$ is  (in $cm ^{2}$)

As shown in the diagram, the length of square garden $ABCD$ is $60\, m$. Flower beds are prepared in the shape of segment on two opposite sides of the square. The centre of the segments is the point of intersection of the diagonals of square $ABCD.$ Find the area of the flower beds. $(\pi=3.14)$ (in $m^2$)

In the adjotning flgure, $PS$ is diemeter of a circle and $PS$ $=12$. $P Q=Q R=R S$ Semicircles are drawn with dinmeter $\overline{\text { PQ }}$ and $\overline{QS}$. Find the perimeter and the area Find the perimeter and the arce of the shaded region. $(\pi=3.14)$

The diameter of a circle with area $38.5\,m ^{2}$ is $\ldots \ldots \ldots \ldots m$.