# Sign of angle in mohr's circle

1. Dec 17, 2016

### fonseh

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. Dec 18, 2016