A) \[\frac{\sqrt{2}\,R}{\sqrt{2}+1}\]
B) \[\frac{\,R}{\sqrt{2}+1}\]
C) \[\frac{\,\sqrt{2}\,R}{\sqrt{2}-1}\]
D) \[\frac{\,\,R}{\sqrt{2}-1}\]
Correct Answer: C
Solution :
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