Hello,
Since we know all of the sides, we can use any of the trig ratios.
Let's work with tangent (Opposite over Adjacent)
We can write the following equation:
tan(P) = 15/8
tan(P) = 1.875
Now, take the inverse of tangent (tan^-1) of 1.875 on your calculator.
You will get 61.9 degrees. You will get the same answer if you use sine or cosine.
Good luck,
MrEQ
