In the same way that we can find an unknown angle from the sin ratio (opposite:hypotenuse), we can do the same with cos and tan.
We can find V° by telling our calculator that 0·556 is the cos of V°, and it will tell us V if we use inverse-cos. Try this:
[inv] [cos]  [·]    [=]
We can find W° in a similar way:
Our answers are slightly inaccurate due to rounding.