Let the given sides be,
x=7
y=11
z=6
To find:

Using the formula,

On substitution we get,

Hence, the ange of X is,

Next, we need to find the angle of y:
Using the formula,

On substitution we get,

Hence, the ange of Y is,

Next, we need to find the angle of Z:
Using the formula,

On substitution we get,

Hence, the ange of Z is,
