| Three circles of diameter 10 cm each, are bound together by a rubber band, as shown in the figure. |
 |
| The length of the rubber band, in cm, if it is stretched as shown, is |
A) 30
B) \[30+10\pi \]
C) \[10\pi \]
D) \[60+20\pi \]
Correct Answer: B
Solution :
Length of the rubber band \[=3d+2\pi r\] \[=\text{(}30+107t\text{)}\,cm\]
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