The values are
.
Apply Pythagorean formula 
(Substitute
)

Subtract 16 from each side.
\ 
Take square root each side.
\
Find A,
\
(Substitute
)

Apply inverse each side.
\

The given triangle ABC is a right angle triangle so 
In a triangle the sum of the angles are 
(Substitute
)

Subtract 116 from each side.
\
The values are
,
,
.