The radius of gyration of a section of area A and least moment of Inertia I about a centroidal axis is
1
A/I
2
I/A
3
\(\sqrt{\frac{I}{A}}\)
4
\(\sqrt{\frac{A}{I}}\)
The radius of gyration of a section of area A and least moment of Inertia I about a centroidal axis is