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Sign of angle in mohr's circle

  1. Dec 17, 2016 #1
    1. The problem statement, all variables and given/known data



    In this question , how could the $$\theta_p$$ and $$\theta_s$$ has the same sign ?
    For $$\theta_p$$ , it is to be rotated clockwise to horizontal axis , right ?
    For $$\theta_s$$ , it is to be rotated anticlockwise to vertical axis , right ?
    They are in different direction , how could they have the same negative sign ?
    2. Relevant equations


    3. The attempt at a solution
     
  2. jcsd
  3. Dec 18, 2016 #2
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