Packing fraction in 2D-hexagonal arrangement of identical spheres is (a) \( \frac{\pi}{3 \sqrt{2...

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Packing fraction in 2D-hexagonal arrangement of identical spheres is
(a) \( \frac{\pi}{3 \sqrt{2}} \)
(b) \( \frac{\pi}{3 \sqrt{3}} \)
(c) \( \frac{\pi}{2 \sqrt{3}} \)
(d) \( \frac{\pi}{6} \)
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