Answer:
39°
Step-by-step explanation:
Angles that are complement to one another add up to 90 degrees.
- This means that Angle 4 + 51 = 90
Now, to find the measure of Angle 4, we subtract 51 from 90.
- [tex]90-51[/tex]
- [tex]39[/tex]
Therefore, the answer is 39°.
