If half the diagonal of a square is $5 \, cm$,then the area of the square is

Find the perimeter of a circular plot which occupies an area of $154 \, m^{2}$ (in $m$).

If an equilateral triangle of area $X$ and a square of area $Y$ have the same perimeter,then $X$ is

Perimeter of a square and an equilateral triangle is equal. If the diagonal of the square is $12 \sqrt{2} \text{ cm}$,then find the area of the equilateral triangle.

Find the diameter of a wheel that makes $113$ revolutions to go $2 \, km$ $26 \, decametres$. (in $m$)

The wheel of a scooter has a diameter of $70\, cm$. How many revolutions per minute must the wheel make so that the speed of the scooter is kept at $66\, km/h$?