A) 5
B) 7
C) 10
D) 14
Correct Answer: C
Solution :
| [c] \[\pi {{R}^{2}}=\pi r_{1}^{2}+\pi r_{2}^{2}\] |
| \[=\pi [r_{1}^{2}+r_{2}^{2}]=\pi \,[{{4}^{2}}+{{3}^{2}}]\] |
| \[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,{{R}^{2}}=25\] |
| \[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,R=25\] |
| \[\therefore \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,d=5\times 2=10\] |
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