The element in the figure is in plane stress: σ_{x} is tensile, σ_{y} is compressive and the shear stresses act in the directions shown. Determine (a) the major principal stress σ_{1} (answer in MPa), (b) the maximum in-plane shear stress (answer in MPa) and (c) the angle θ_{p}, measured anticlockwise from the x-axis, of the normal to the plane on which σ_{1} acts (answer in degrees).