Template:Atomic packing factor (rhombohedral)/doc

Calculates the atomic packing factor for rhombohedral.

a=b=c

α=β=γ≠90

First it determines the atomic radius
 * If angle > 60 degrees then atomic radius = /2.
 * If angle < 60 degrees then atomic radius = * sin( 0.5 *  )

Then the atomic packing factor is easily calculated.
 * number of Lattice points per unit cell * volume of atom / volume of unit cell

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Examples
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