The diameter of a wheel of a car is $77 \mathrm{cm}$. Find the distance covered by the wheel in $500$ revolutions.

Find the area of a rectangle whose length is $36 \mathrm{cm}$ and breadth $15 \mathrm{cm}$.

If the area is k ${\text{cm}}^2$ , then write the value of k.

The area of a square lawn of side $15 \mathrm{m}$ is

A polygon having all sides equal and all angles equal is called a _____polygon.