question_answer

What is the difference of circumferences of the circles shown?

A)  22 cm                                    

B)  20 cm

C)  24cm                                   

D)  26cm

Correct Answer: A

Solution :

 Radius of outer circle \[=14\text{ }cm\] \[\Rightarrow \] Circumference \[=88\text{ }cm\] Radius of inner circle \[=14-3.5=10.5\text{ }cm\] \[\Rightarrow \]Circumference = 66 cm \[\therefore \] Difference of circumferences \[=88-66\text{ }cm=22\text{ }cm\]