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 $66\, km/h$?

If the circumference of a circle is equal to the perimeter of a square,what is the ratio of the area of the circle to the area of the square?

The length of each side of an equilateral triangle is $12\, cm$. The height of the triangle is

$A$ playground is in the shape of a rectangle. $A$ sum of ₹ $1,000$ was spent to make the ground usable at the rate of $25$ $paisa$ per $m^2$. The breadth of the ground is $50\, m$. If the length of the ground is increased by $20\, m$,what will be the expenditure in rupees at the same rate per $m^2$?

Length of a rectangle is twice of its breadth. Area of the rectangle is $18 \, m^{2}$. What would be its perimeter? (in $m$)

If the measures of a diagonal and the area of a rectangle are $25\, cm$ and $168\, cm^2$ respectively,what is the length of the rectangle? (in $cm$)