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Figure 4 shows a cross-section of a composite structure. Determine: (a) the coordinate of centroid C for the cross-section. [17 Marks] [CO3, PO3, C4] (b) the moments of inertia for the cross-sectional area about the x-axis, [15 Marks] [CO3, PO3, C4] (c) the volume of the structure by revolving the shaded area about the y- axis using the theorem of Pappus-Guldinus [3 Marks] 100 mm 50 mm 100 mm 60 mm ↓ 150 mm Figure 4 50 mm 50 mm 50 mm x