Angle ranking - obtuse angles?

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ArugulaSalad

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Do you guys have any recommendations for differentiating between obtuse angles?
My method for acute angles is to draw an imaginary line between the angle and compare the sizes of those lines. This method has been okay for acute angles, but hasn't been working too well for anything over ~120 degrees.
I have tried to make an imaginary 180 degree line and compare the supplementary angles, but noticed that this becomes difficult to do if the angles are oriented differently..

My only source of PAT practice is Bootcamp. My scores fluctuate a bit in angle ranking; I usually get anywhere from 10 - 15/15, but I did Test 8 last night and got a 8/15 🙁 (I felt that it had more obtuse angles than usual though).
Any suggestions? Thank you in advance.
 
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