The perimeter of a semicircular table-top is $3.60\,m .$ Then, its radius is $\ldots \ldots \ldots . . cm .$
$35$
$70$
$105$
$140$
In a circle with radius $30\,cm ,$ a minor arc subtends an angle of measure $60$ at the centre. Then, the area of the minor sector formed by that arc is $\ldots \ldots \ldots \ldots$ $cm ^{2}$. $(\pi=3.14)$
In a circle with radius $7\,cm ,$ the area of a minor sector can be $\ldots \ldots \ldots \ldots cm ^{2}$.
In $\odot( O , r),$ minor $\widehat{ ACB }$ subtends an angle of measure $72$ at the centre. Then, the ratio of the length of minor $\widehat{A C B}$ and the circumference of the circle is ............
In a circle with radius $6\, cm ,$ a minor are subtends an angle of measure $60$ at the centre. Find the area of the minor sector and the major sector corresponding to that arc.
The area of a circular playground is $22176\, m ^{2}$. Find the cost of fencing this ground at the rate of $Rs.\, 50$ per $metre.$ (in $Rs.$)