Answer:
23.6°
Step-by-step explanation:
The relevant trig relationship is ...
Sin = Opposite/Hypotenuse
This tells you ...
sin(Z) = XY/YZ = 6/15 = 2/5
The inverse sine (arcsine) function is used to find the angle when its sine is known.
Z = arcsin(2/5)
Z = 23.6°
