Two conventional CD triaxial compression tests were conducted on a dense angular dry sand at the same void ratio. Test A had a confining pressure of $150$ kPa $,$ while in test B the confining pressure was $600$ kPa ; these stresses were held constant throughout the test. At failure, tests A and B had maximum principal stress differences of $600$ and $2550$ kPa $,$ respectively.

a$.$ Plot the Mohr circles for both tests at initial conditions and at failure.

b$.$ Assuming $c=0,$ determine $.$

c$.$ What is the shear stress on the failure plane at failure for both tests?

d$.$ Determine the theoretical orientation of the failure plane in each specimen.

need proper mohrs circles and detailed solution.

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please do it correctly mohrs circle i request you