The Total solution for NCERT class 6-12
If the radius of theoctachedral void is r and radius of the atoms in close packing is R, deriverelation between r and R.
A sphere with centre O, isfitted into the octahedral void as shown in the above figure. It can beobserved from the figure that ΔPOQ is right-angled
∠POQ = 900
Now, applying Pythagorastheorem, we can write: