A tensile stress of 688 MPa is applied to a metal sample with a square cross-sectional area. The starting length of the specimen was 163 mm and the starting length of one edge of the square cross section was 19.2 mm. If the deformation is purely elastic, by how much will the area of the square cross section decrease under this applied load in mm²? This question is asking for the magnitude (absolute value) of the change in area. The material has a Poisson's ratio of 0.317, an elastic modulus of 77.4 GPa, a yield strength of 863 MPa, and a tensile strength of 1,258 MPa.