The components of state of stress at a point in x - y plane are given as σxx = 5 MPa, σyy = 10MPA and $${\tau _{xy}}$$ = 2MPa. The sum of the principal stresses acting on the x - y plane in MPa is
A. 15
B. 11.7
C. 12.7
D. 13.7
Answer: Option A
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