1. The problem statement, all variables and given/known data For part b , i think one of the angle either $$\theta_s$$ or $$\theta_p$$ is wrong For the second question , what is plane stress ? 2. Relevant equations 3. The attempt at a solution 1.) Because in mohr's circle, the maximum shear stress on the vertical axis , for the maximum normal stress , it's on the horizontal axis , right ?