A Consolidated Drained $($CD$)$ triaxial test was performed on a sample of sand. The

initial effective confining pressure was $100$ kPa $.$ The sample was sheared and the

deviator stress at failure was $440$ kPa $.($a$)$ Draw the Mohr circle at failure on a Mohr

diagram. $($b$)$ Determine the Mohr$-$Coulomb strength parameters.

An Unconsolidated Undrained $($UU$)$ triaxial test was performed on three identical

samples clay and the results are shown in the table below. $($a$)$ Draw the Mohr circles

at failure on a Mohr diagram, $($b$)$ Determine the Mohr$-$Coulomb strength parameters,

$($c$)$ Do you think the clay is saturated or unsaturated? Explain.