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@omprakash-Um9Ko0 • Oct 2, 2016
Fn= Normal Stress i.e. perpendicular to plane
Fs= Tangential stress or shear stress i.e. parallel to plane
And Fn and Fs is perpendicular to each other where F is resultant stress so using Pythagoras Theorem
F =โ(Fn^2+Fs^2)
And theta = tan inverse ( Fs/Fn)