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C_y	Area


Moment of Inertia about the x_c axis I_xc	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 z_c axis r_zc
	r_zc² = k_xc²+k_yc²