3. (25分) On the surface of a structural component, the strains are monitored bymeans of three strain gages arranged as shown in the figure. The following strainswere recorded:
εa = 1100 X 10-6, εb =200x10-6, and εc =200x10-6.
The material properties of the metal alloy are E = 70 GPa, v= 0.33
You MUST draw Mohr's circle (i)(4分) to determine the following quantities and showthe results of principal strains (ii)and stresses(iii)on sketches of properly oriented elements(2分each,共4分):

(a) (2分) the corresponding shear strain, γxy =_________