= 10-9. The state of strain at the point on the member has components of Ex = 180(10-6), Ey -120(10-6), and Yxy = 100(10). Use the strain transformation equations to determine (a) the in-plane principal strains and (b) the maximum in-plane shear strain and average normal strain. In each case specify the orientation of the element and show how the strains deform the element within the x-y plane. X Prob. 10-9