The diameter of a circular garden is $210 \,m .$ Inside it, all along the boundary, there is a path of uniform width $7 \,m .$ Then, the area of the path is $\ldots \ldots \ldots \ldots m ^{2}$.

The radius of a circular ground is $35 \,m$. Outside it, runs a road of width $3.5\, m$. Find the area of the road. (in $m^2$)

In a circle with radius $7\,cm ,$ the area of a minor sector can be $\ldots \ldots \ldots \ldots cm ^{2}$.

As shown in the diagram, rectangle $ABCD$ is a metal sheet in which $CD =20\, cm$ and $BC =14 \,cm .$ From it, a semicircle with diameter $\overline{ BC }$ and a sector with centre $A$ and radius $AD$ is cut off. Find the area of the remaining sheet. (in $cm^2$)

As shown in the diagram, the length of square $ABCD$ is $35 \,cm .$ Semicircles are drawn on its sides $\overline{ AB }$ and $\overline{ CD }$ Find the area of the shaded region. (in $cm^2$)

In $\odot( O , 4), \widehat{ ACB }$ is a minor arc and $m \angle AOB =45 .$ Then, the length of minor $\widehat{ ACB } $ is $\ldots \ldots \ldots \ldots$