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This is a similar post to one before, but that didn't offer much more than i know already.

a = width of cell - depth of cell

c= height of cell

c/2 = height of central atom

So i have various formula for a few isosceles lengths, namely a/2*cos30 for the base line of the vertical right-angle triangle connecting to the 'central' atom. and c/2 for the line connecting the base to the atom its self.

I am simply having trouble relating the two unknowns from here. i have tired pythagoras but cant yield anything suitable. Any hints?

Dan

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# Calculating ratio c/a as 1.633 in HCP?

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