Trigonometry (Find angle)

I assume that y is one of the leg and x is the hypotenuse because that would look like a perfect Pythagorean triple.

And I assume that BAC is an angle and it is included in x and y.

And I assume that y is opposite to angle BAC

If I did not assume these I can't do anything with your question.

 

That way:

cos BAC = 7/25

BAC = 73.7 degrees,

 

Please try to give a more detailed question next time