A) \[\sqrt{{{d}^{2}}+{{(R-r)}^{2}}}\]
B) \[\sqrt{{{d}^{2}}-{{(R+r)}^{2}}}\]
C) \[\sqrt{{{(R+r)}^{2}}+{{d}^{2}}}\]
D) \[\sqrt{{{d}^{2}}-{{(R-r)}^{2}}}\]
Correct Answer: D
Solution :
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