The ratio of areas of two circles is $25: 36 .$ Then, the ratio of their circumferences is.........
$5: 6$
$6: 5$
$25: 36$
$36: 25$
The ratio of radii of two circles is $2: 3$ and the ratio of the angles at centre of two minor sectors of those circles is $5: 2 .$ Then, the ratio of the areas of those sectors is...........
The circumference of a circular ground is $352\, m$. Find the area of the ground. (in $m^2$)
The radius of a circular ground is $35\, m$. Inside it, $3.5 \,m$ broad road runs around its boundary. A part of the road between two radii forming an angle of measure $72$ at the centre is to be repaired. Find the cost of repairing at the rate of ₹ $80 / m ^{2}$. (in ₹)
A piece of wire $20 \,cm$ long is bent into the form of an arc of a circle subtending an angle of $60^{\circ}$ at its centre. Find the radius of the circle. (in $cm$)
In $Fig.$ a circle of radius $7.5 \,cm$ is inscribed in a square. Find the area of the shaded region (Use $\pi=3.14$ ) (in $cm^2$)