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You would use opp/adj  here (tan), therefore, the equation would be tan(x) = 115/85, tan(x) = 1.35, then divide 1.35 by tan. I don't have a calculator on hand but I hope that helps.
By drawing the situation, we end up with the triangle below.We see that we need to use the trigonometric ratio tan. We can set up the following:

tanΘ=[tex] \frac{115}{85} [/tex]
tanΘ=1.3529 (it's always best to round to 4 digits for accuracy)
To find the angle, we need to find the inverse of the function, which is tan^-1

[tex]tan^{-1} 1.3529[/tex]
=53.52 or in your case (rounded) 53.5

:)


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