The state of strain at the point on the spanner wrench has components of ε_x= 260(10^-6), ε_y= 320(10^-6), and γ_xy= 180(10^-6). 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.