This is for body-centered cubic crystal structure.(adsbygoogle = window.adsbygoogle || []).push({});

1. The problem statement, all variables and given/known data

Prove a = 4R/sqrt(3). R is the radius of sphere and a is the edge of the cell (cubic).

The image attached will be cut into cube so that 4 outter spheres' centers will be the edges of the cube, a.

2. Relevant equations

n/a

3. The attempt at a solution

Well, the disagnal from the farthest two points are 4R.

I tried to use one face to calculate the diagnal edge of the face and form a triangle with 4R and sqrt(2) but it won't work.

Something is wrong...please help!

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# Homework Help: Simple Math question. (Geometry)

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