Find the measure of angle y. Round your answer to the nearest hundredth. (please type the numerical answer only)

We are given the hyp (20) and the opp side (4). Use the sine function:
opp 4
------ = sin y = --------- = 0.2
hyp 20
Now find y by using the inverse sine function: arcsin 0.2 = y.
y = 0.201 radians or 11.5 degrees.