The circumference of a circle is $176 \,cm .$ Find its radius. (in $cm$)
$48$
$33$
$18$
$28$
Area of the largest triangle that can be inscribed in a semi-circle of radius $r$ units is
A running track is in the shape of a circular ring. The difference of its outer circumference and inner circumference is $44\,m .$ Then, the width of the track is $\ldots \ldots \ldots \ldots$$m$.
A cow is tied with a rope of length $14\, m$ at the corner of a rectangular field of dimensions $20 \,m \times 16 \,m$. Find the area of the field in which the cow can graze. (in $m ^{2}$)
The length of the minute hand of a clock is $7\,cm$. The area of the region swept by it in $20$ minutes is $\ldots \ldots \ldots . cm ^{2}$.
In the given diagram, the shaded portion represents flower bed in a plot. If $m \angle O=90, O B=21 \,m$ and $OD =14 \,m ,$ find the area of the flower bed. (in $m^2$)