Three soil elements are shown below. For each soil element, determine the following parameters

using BOTH equations and Mohr$$s circles:

$(1)$ Major and minor principal stresses

$(2)$ Normal and shear stresses on plane AB

Note that when using the Mohr$$s circle approach, Mohr$$s circles need to be drawn using a

software or compass to scale. Points will be deducted for hand$-$drawn Mohr$$s circles.

$($a$)$

$($b$)$

$($c$)$