A,B,C,E (red dots) will represents the centres of sphere of atoms in HCP closed packing,
now, AB=BC=CA=EB = 2R (edge lengths of HCP)
,as BD divides the median through B in 2:1 ratio from B...
now EDB is rt. triangle,
by pythagores theorem :
now, their will be another atom which will be mirror image of E on plane ABC
so, the height (c) of HCP will be 2h
Best Of luck
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