Alka Tuli and Rajesh Hassija Solutions for Chapter: Perimeter and Area, Exercise 7: Review Time

If a square has an area $64 {\mathrm{cm}}^2$, then the perimeter of the square is _____.

$1 \mathrm{hectare}=$ _____

$480 {\mathrm{cm}}^2=$_____ ${\mathrm{mm}}^2$.

Area of a triangle is _____.

What is the area of parallelogram with base $44 \mathrm{cm}$ and altitude $14 \mathrm{cm}$?

If the circumference of a circle is $4\mathrm{\pi r}$, what is its area?

The approximate value of $\mathrm{\pi }$ is

The area of a circular ring with outer and inner radii $\mathrm{R}$ and $\mathrm{r}$ respectively is _____.