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Math
 
Rectangular S Beam

Cx Cy Area
Moment of Inertia
about the xc axis
Ixc		 Moment of Inertia
about the yc axis
Iyc		 Polar Moment of Inertia
about the zc axis
Jzc
= Ixc+Iyc
Radius of Gyration
about the xc axis
kxc		 Radius of Gyration
about the yc axis
kyc		 Radius of Gyration
about the zc axis
rzc
rzc2 = kxc2+kyc2