(Solved): Determine the Second Moment of Area for the composite area shown in Figure \( 4.2 \mathrm{~b} \) w ...

Determine the Second Moment of Area for the composite area shown in Figure \( 4.2 \mathrm{~b} \) with respect to \( x \)-axis \( \left(I_{x x}\right) \) in \( \times 10^{6} \mathrm{~mm} 4 \). Given \( B=120 \mathrm{~mm}, D=150 \mathrm{~mm}, t_{f}=18 \mathrm{~mm} \mathrm{~mm} \) and \( t_{W}=35 \mathrm{~mm} \). Figure \( 4.2 \mathrm{~b} \)