A) \[\frac{7}{2}\,cm\]
B) \[14\,cm\]
C) \[7\,cm\]
D) \[21\,cm\]
Correct Answer: C
Solution :
| [c] Area of big circle |
| \[=\pi {{R}^{2}}=616\,\,\,\,\,\Rightarrow \,\,\,R=14cm\] |
| and area of small circle |
| \[=\pi {{R}^{2}}=154\,\,\,\,\,\Rightarrow \,\,\,r=7cm\] |
| \[\therefore \] Breadth of the ring \[=14-7=7\,cm\] |
You need to login to perform this action.
You will be redirected in
3 sec
