A) 16 times
B) 8 times
C) 4 times
D) 2 times
Correct Answer: C
Solution :
Let original radius = r Then, area =\[\pi {{r}^{2}}\] Now, new radius = R Then, \[\pi {{R}^{2}}=16\pi {{r}^{2}}\] R = 4r Now, Circumference \[=2\pi r\] \[=2\pi \times 4r\] \[=4\times (2\pi r)\] Hence, circumference increased 4 times.
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