What is the measure of an angle of a right triangle if the side opposite the angle has length 4 and the hypotenuse has length 8?

- So far I did:
sin x = 4/8
x = sin^-1 (4/8)
x = 0.50°

- I'm not sure what to do next

inverse sine means "the angle whose sine is"

in this case ... 1/2 (or .50)