A twodimensional truss shown in the figure is made of aluminum with Young's modulus \(E=80 \mathrm{GPa}\) and failure stress \(\sigma_{Y}=150 \mathrm{MPa}\). Determine the minimum crosssectional area of each member so that the truss is safe with safety factor 1.5.

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Pin joint (2) 60 kN (1) (3) 12 cm 9 cm Roller support