The homogeneous state of stress for a metal part undergoing plastic deformation is $$T = \begin{pmatrix} 10 & 5 & 0 \\ 5 & 20 & 0 \\ 0 & 0 & -10 \end{pmatrix}$$ where the stress component values are in MPa. Using von Mises yield criterion, the value of estimated shear yield stress, in MPa is
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