Find the perimeter (in $cm$) of a semicircle of radius $28\, cm$.

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

If the length of one side and the diagonal of a rectangle are $7 \text{ cm}$ and $25 \text{ cm}$ respectively,then find its perimeter (in $\text{cm}$).

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

The length of a rectangle is thrice its breadth and its perimeter is $96 \, m$. The area of the rectangle is......$m^2$

If the length and breadth of a rectangular plot are increased by $50 \%$ and $20 \%$ respectively,then the new area is how many times the original area?