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## Main Question or Discussion Point

iv been asked to show that the ideal c/a ratio for a hexagonal close packing unit cell is 1.633. The only thing i could come up with was to do with the atomic packing factor. where i get (4/3pi^2r*6) / (3a*2r*c). Am i heading in the right direction or am i way off course. If im way off would anyone be able to give me a hand?

Cheers

Cheers