A) 21 m
B) 10.5 m
C) 7 m
D) 5.25 m
Correct Answer: B
Solution :
Let the outer circle be R and inner circle be r. \[2\pi R-2\pi r=66\] \[2\pi (R-r)=66\] \[\Rightarrow \] \[2\times \frac{22}{7}\times (R-r)=66\] \[\therefore \] \[R-r=66\times \frac{7}{22}\times \frac{1}{2}=\frac{21}{2}=10.5\,\text{m}\]You need to login to perform this action.
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