What is the rotational inertia (moment of inertia) of a solid cylinder rotating about the central diameter (se

What is the rotational inertia (moment of inertia) of a solid cylinder rotating about the central diameter (see Fig. 2 of lab manual for diagram) if the mass of the cylinder is 8 kg, and the diameter and length are 0.29 m and 0.5 m, respectively?

R = D/2 = .29/2 = 0.145 m

Icyl = ½mR² = ½*8*0.145² = 0.0841 kg∙m²

Note that the length is not used.....