Centroid, Area, Moments of Inertia, Polar Moments of Inertia, & Radius of Gyration of a Square Channel

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C_x	C_y	Area


Moment of Inertia about the x_c axis I_xc	Moment of Inertia about the y_c axis I_yc	Polar Moment of Inertia about the z_c axis J_zc
		= I_xc + I_yc

Radius of Gyration about the x_c axis>k_xc	Radius of Gyration about the y_c axis k_yc	Radius of Gyration about the z_c axis r_zc
		r_zc² = k_xc²+k_yc²