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# HELP ASAP

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Four unit spheres are externally tangent to each other and all of them are internally tangent to a larger sphere. The radius of the larger sphere can be expressed as $$\frac{\sqrt{a}}{2} + b$$, where a,b are two positive integers. Find a+b.

Jun 30, 2022

### 1+0 Answers

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I get that the radius   = 1 + sqrt (2)

Jun 30, 2022