12.1 For the I-shaped cross-section in Figure 12.1, determine the moment of inertia about the x and y axes by: a) b) considering the cross-section as three individual rectangular pieces. (4 Marks) considering the cross-section as one large rectangular piece and two rectangular "holes" between the flanges, on each side of the web. (4 Marks) 100 mm 100 mm 100 mm Figure 12.1 100 mm 100 mm 100 mm