You want to find angle X
Opposite side = 7
Hypotenuse = 9
You have the opposite side and the hypotenuse, so you will need to use “Sin^-1”
Sin^-1 ( opposite side / hypotenuse )
Sin^-1 ( 7/9 ) = 51.05755873101862
Rounded to the nearest degree = 51°
Have a good day ^^