R S Aggarwal Solutions for Chapter: Concept of Perimeter and Area, Exercise 2: EXERCISE 21B

Find the circumference of a circle whose radius is

$10.5 \mathrm{cm}$

Find the circumference of a circle whose radius is  

$3.5 \mathrm{m}$

Find the circumference of a circle whose diameter is $14 \mathrm{cm}$.

Find the circumference of a circle whose diameter is 

$35 \mathrm{cm}$

Find the circumference of a circle whose diameter is 

$10.5 \mathrm{m}$

If the radius of a circle is $r \mathrm{cm}$ whose circumference is $176 \mathrm{cm}$, find the value of $r$.

If the diameter of a wheel whose circumference is $264 \mathrm{cm}$ is $k \mathrm{cm}$, find the value of $k$

The diameter of the wheel of a car is$70 \mathrm{cm}$. How many revolutions will it make to travel $1.65 \mathrm{km}$?