Financial institutions with a very large reach, such as national banks, usually have less personal customer service than smaller institutions like credit unions, and often have more complicated bureaucratic structures. despite this, what are some advantages of larger financial institutions over smaller ones?

Larger financial institutions usually cater to big businesses.
compared to smaller institutions, larger financial institutions have a wider range of products they can offer to their clientele. they also give provide better security to the clientele because of their size and market visibility. larger financial institutions do not easily go bankrupt or close down  because they also have other investments that will them continue their operations. also, larger financial institutions are companies where smaller institutions invest their pooled funds. 

If the diameter is 8 than the radius is 4 because 2r or 2*radius equals the diameter. 4*2=8. 8/2=4.