Define radius ratio what is the value of radius ratio for octahedral gemotry ?

Explanation

Radius ratio may be defined as the ratio of the radius of cation to the radius of anion.
Radius ratio`=("Radius of cation" (r^(+)))/("Radius of anion" (r^(-)))`
for octahedral geomertry, radius ratio lies between 0.414 and 0. 732.