The infinitesimal element shown in the figure (not to scale) represents the state of stress at a point in a body. What is the magnitude of the maximum principal stress (in N/mm², in integer) at the point?
In a two-dimensional stress analysis, the state of stress at a point is shown in the figure. The values of length $PQ$, $QR$, and $RP$ are $4$, $3$, and $5$ units, respectively. The principal stresses are (round off to one decimal place)
