Show that the radius of gyration of an ideal H-polymer with all five sections containing an equal number (N/5) of Kuhn monomers of length b is:

\(\displaystyle (R_g)^2 = (Nb^2/6)(89/625)\)

I know the definition of the radius of gyration, but I've been having a difficult time deducing this particular equation from there.

Any help is appreciated.