So tight

Geometry Level 3

Nine balls of 2-cm diameter are tightly packed in a boxed as shown above. What is the height in cm of the box?

2 + 2 3 2 + 2\sqrt3 6 6 2 + 3 2+\sqrt3 2 3 + 3 2 \sqrt3 + 3

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1 solution

I hope this must clear things out:

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