The composite cross section for the column consists of two cover plates riveted to two channels. Determine the radius of gyration k with respect to the centroidal axis. Each channel has a cross-sectional area of Ac = 11.8 in.2 and moment of inertia (I )c = 349 in.4.

The composite cross section for the column consists of two cover plat

1.	The composite cross section for the column consists of two cover plates riveted to two channels. Determine the radius of gyration k with respect to the centroidal axis. Each channel has a cross-sectional area of Ac = 11.8 in.2 and moment of inertia (I )c = 349 in.4.
A.	k = 7.74 in.
B.	k = 6.29 in.
C.	k = 5.44 in.
D.	k = 4.25 in.
Answer» B. k = 6.29 in.