Convert
to exponential/polar/trigonometric form:



By DeMoivre's theorem,


so that
and
.
Answer:
y = 11.54°
Step-by-step explanation:
Reference angle = y°
Opposite side length = 4
Hypotenuse = 20
Apply trigonometric function SOH:




y = 11.536959° ≈ 11.54° (nearest hundredth)
It would be web plato because thats how it is, i think.