Template:Volume of rhombohedron/doc

This template is used by other templates to calculate the atomic packing factor.

Wikipedia:
 * The volume of the rhombohedron whose side length is  'a' is a simplification of the volume of a parallelepiped and is given by


 * $$\text{Vol} = a^3(1-\cos\theta)\sqrt{(1+2\cos\theta)}. $$

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