Ok so this is SAS which is the law of cosines If you want to solve for the angle The formula for is Cos inverse(a^2-b^2-c^2/-2bc) = A degrees. The thing is we need to solve for the renaming side length first which you would usually use the other law of cosines formula but in this case you would could use phy theorem cause it’s a right triangle(we don’t know if it’s a special right triangle) so it would be 6.1^2 + x^2 = 8.8^2 (x being the remaining side length) 37.21 + x^2 = 77.44 X ~ 6.34
Then you would plug it in to the formula above for angle a