The centre is $C=(\sigma_x+\sigma_y)/2=10$ MPa and radius $R=\sqrt{[(\sigma_x-\sigma_y)/2]^2+\tau_{xy}^2}=\sqrt{800}=28.28$ MPa. The principal stresses are −18.28 and 38.28 MPa. Construction B places the centre at +10 and uses the correct positive-slope diameter for the plotted shear convention.
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