SOLVE BOTH USING MOHRS CIRCLE

Problem $1$:

For the given state of stress, determine the normal and shearing stresses exerted on the oblique

face of the shaded triangular element $($Element a and element b$)$ shown.

a$)$

b$)$

Problem $2$:

For the given state of stress, determine $($a$)$ the principal planes, $($b$)$ the principal stresses.