There are two ways to list the angles: 
1) Simply name them based on the points: 
∠W , ∠X , ∠Y , ∠Z
2) The way that I believe that you are supposed to list them in this case. List them as such: 
∠WYZ , ∠YZX , ∠ZXW , ∠XWY
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10+2=12-06/6=6
Hope this helped you ^^