Equally important, knowing a ratio between sides, we can use calculators to give us the unknown angle. Easy life!
We can find V° by telling our calculator that 0·833 is the sin of V°, and it will tell us V if we use inverse-sin. Try this:
[inv] [sin]  [·]    [=]
Some calculators have a second-function button [2nd F] instead. Remember also that older ones will require the number to be put in first. Either way, you should be given the answer:
56.4° or close enough!