Answer:
The hypotenuse is
and the other missing side is 12
Explanation:
We use the 60 degree angle and side length 4sqrt(3) to find the hypotenuse using,
H = Hypotenuse
Y = The other side that we need to find
cos(a) = Adjacent/H
H = Adjacent/cos(a)

Now, finding the other side,
Using
tan(a) = Y/Adjacent
Y = (Adjacent)(tan(a)

hence the hypotenuse is 8sqrt(3) and the other side is 12