How Can θp and θs Have the Same Sign in Mohr's Circle?

[fonseh]

Homework Statement

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 ?

Homework Equations

The Attempt at a Solution

 

[fonseh]

http://web.mit.edu/course/16/16.unified/www/FALL/materials/documents/HO-M-6(Mohrs)(08).pdf

I found this on the Internet . At there , the author defined positive as counterclockwise rotation .
and also “
Positive shear would cause a clockwise rotation of the infinitesimal element about the element center.
”
So , is the example in the video wrong ?