A) 6 cm
B) 3.2 cm
C) 3 cm
D) 3.5 cm
Correct Answer: C
Solution :
[c] Let the original radius be R cm. Then,\[\pi \,\times [{{(R+1)}^{2}}-{{R}^{2}}]=22\] \[\Rightarrow \] \[\frac{22}{7}\times (R+1+R)(R+1+R)=22\] \[\Rightarrow \] \[2R+1=7\] \[\Rightarrow \] \[2R=6\]\[\Rightarrow \]\[R=3\,cm\] |
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