A) 22 m
B) 20 m
C) 21 m
D) 24 m
Correct Answer: C
Solution :
Let \[{{r}_{1}}\] and \[{{r}_{2}}\] be the radius of inner and outer circle, \[\therefore \] \[2\pi {{r}_{2}}-2\pi {{r}_{1}}=132\] \[\Rightarrow \] \[{{r}_{2}}-{{r}_{1}}=\frac{132\times 7}{2\times 22}\] \[\Rightarrow \] \[{{r}_{2}}-{{r}_{1}}=21\,\,m\]You need to login to perform this action.
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