3. Find the location of the centroid of the built up section (X, Ỹ) composed of a C380x74 channel welded to a W360x122 I-beam. Calculate the moment of inertia (second moment of area) of the built up beam about both its centroidal axes. BUILT UP SECTION SYMMETRIC ABOUT y1-y1 AXIS C380x74 AREA: 9480 mm^2 381- y1 lyc: 168x10^6 mm^4 Ixc: 4.60x10^6 mm^4 CENTROID OF C380x74 ус 20.3 363 x1- W360x122- х1 XC- XC AREA: 15500 mm^2 381.2 ус Ixx: 365x10^6 mm^4 ALL DIMENSIONS lyy: 61.5x10^6 mm^4 IN MILLIMETERS

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