a=2r
where a is horizontal distance of hexagonal system
c= (1.633*a)
or
C=(4r)*(SQRT(2/3))
need help further
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Vanadinite and molybdenite are two minerals that are categorized in the hexagonal crystal system.
Constants in the sense you mean are different to mathematical constants. They usually refer to a system in which two values are proportionate and so are of the units associated with the system.
it is hexagonal
12
Hexagonal. Trigonal Crystal System.
hexagonal crystal system ( 6 sided )
Points with integer coordinates are often called lattice points. Lattices exist in all dimensions.When we talk about lattices points on the rectangular Cartesian coordinate system, this is a two dimensional lattice. Three dimensional lattice points are often used to study crystals.
The chemical formula of beryl is Be3Al2(SiO3)6. The crystallization system is hexagonal.
System Internationale. This is the system used by internationally by scientists to avoid unit conversions and eliminate the need for extra constants in equations.
The body-centered cubic system has a lattice point at each of the eight corner points of the unit cell plus one lattice point in the centre. Thus it has a net total of 2 lattice points per unit cell ( 1⁄8 × 8 + 1).The face-centered cubic system has lattice points on the faces of the cube, that each gives exactly one half contribution, in addition to the corner lattice points, giving a total of 4 lattice points per unit cell ( 1⁄8 × 8 from the corners plus  1⁄2 × 6 from the faces).
It means multiplying with constants from a non metric system (such as length using yards, feet, inches) to a metric system (using meters)
In the circumstances, none of the "following" are not variables.