The area of an equilateral triangle,each of whose sides measures $2 \sqrt{3} \text{ cm}$ is

If the perimeter of an equilateral triangle is $12\, m$,then find its area.

$A$ steel sphere of radius $4 \, cm$ is drawn into a wire of diameter $4 \, mm$. Find the length of the wire in $mm$.

In a swimming pool measuring $90\, m$ by $40\, m$,$150$ men take a dip. If the average displacement of water by a man is $8\, m^3$,what will be the rise in water level? (in $cm$)

$A$ circular road runs round a circular ground. If the difference between the circumferences of the outer circle and the inner circle is $66 \, m$,the width of the road is ....... $m$.

If the ratio of areas of two squares is $225: 256,$ then the ratio of their perimeters is